add initial part

.idea/misc.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_10" default="true" project-jdk-name="10" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
\ No newline at end of file

.idea/modules.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/JTankTrouble.iml" filepath="$PROJECT_DIR$/JTankTrouble.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file

.idea/workspace.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ChangeListManager">
+    <list default="true" id="0b3d586d-9f0f-4ca4-b09d-03a200e1e684" name="Default Changelist" comment="" />
+    <option name="SHOW_DIALOG" value="false" />
+    <option name="HIGHLIGHT_CONFLICTS" value="true" />
+    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
+    <option name="LAST_RESOLUTION" value="IGNORE" />
+  </component>
+  <component name="FileTemplateManagerImpl">
+    <option name="RECENT_TEMPLATES">
+      <list>
+        <option value="Class" />
+      </list>
+    </option>
+  </component>
+  <component name="ProjectId" id="1dzFnqOFYxXXFNWi9beGa9Sc8UF" />
+  <component name="ProjectViewState">
+    <option name="hideEmptyMiddlePackages" value="true" />
+    <option name="showExcludedFiles" value="true" />
+    <option name="showLibraryContents" value="true" />
+  </component>
+  <component name="PropertiesComponent">
+    <property name="RunOnceActivity.ShowReadmeOnStart" value="true" />
+    <property name="WebServerToolWindowFactoryState" value="false" />
+    <property name="aspect.path.notification.shown" value="true" />
+  </component>
+  <component name="RecentsManager">
+    <key name="CreateClassDialog.RecentsKey">
+      <recent name="UI" />
+    </key>
+  </component>
+  <component name="RunManager">
+    <configuration name="Main" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
+      <option name="MAIN_CLASS_NAME" value="UI.Main" />
+      <module name="JTankTrouble" />
+      <extension name="coverage">
+        <pattern>
+          <option name="PATTERN" value="UI.*" />
+          <option name="ENABLED" value="true" />
+        </pattern>
+      </extension>
+      <method v="2">
+        <option name="Make" enabled="true" />
+      </method>
+    </configuration>
+    <recent_temporary>
+      <list>
+        <item itemvalue="Application.Main" />
+      </list>
+    </recent_temporary>
+  </component>
+  <component name="SvnConfiguration">
+    <configuration />
+  </component>
+  <component name="TaskManager">
+    <task active="true" id="Default" summary="Default task">
+      <changelist id="0b3d586d-9f0f-4ca4-b09d-03a200e1e684" name="Default Changelist" comment="" />
+      <created>1593420189445</created>
+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1593420189445</updated>
+      <workItem from="1593420197831" duration="14275000" />
+      <workItem from="1593598248640" duration="34000" />
+      <workItem from="1593723764237" duration="20000" />
+    </task>
+    <servers />
+  </component>
+  <component name="TypeScriptGeneratedFilesManager">
+    <option name="version" value="1" />
+  </component>
+  <component name="WindowStateProjectService">
+    <state x="574" y="122" key="#com.intellij.ide.util.MemberChooser" timestamp="1593430072090">
+      <screen x="0" y="0" width="1536" height="824" />
+    </state>
+    <state x="574" y="122" key="#com.intellij.ide.util.MemberChooser/0.0.1536.824@0.0.1536.824" timestamp="1593430072090" />
+    <state x="566" y="298" width="403" height="237" key="#com.intellij.refactoring.move.moveClassesOrPackages.MoveClassesOrPackagesDialog.classes" timestamp="1593430104059">
+      <screen x="0" y="0" width="1536" height="824" />
+    </state>
+    <state x="566" y="298" width="403" height="237" key="#com.intellij.refactoring.move.moveClassesOrPackages.MoveClassesOrPackagesDialog.classes/0.0.1536.824@0.0.1536.824" timestamp="1593430104059" />
+    <state width="1493" height="210" key="GridCell.Tab.0.bottom" timestamp="1593457418246">
+      <screen x="0" y="0" width="1536" height="824" />
+    </state>
+    <state width="1493" height="210" key="GridCell.Tab.0.bottom/0.0.1536.824@0.0.1536.824" timestamp="1593457418246" />
+    <state width="1493" height="210" key="GridCell.Tab.0.center" timestamp="1593457418246">
+      <screen x="0" y="0" width="1536" height="824" />
+    </state>
+    <state width="1493" height="210" key="GridCell.Tab.0.center/0.0.1536.824@0.0.1536.824" timestamp="1593457418246" />
+    <state width="1493" height="210" key="GridCell.Tab.0.left" timestamp="1593457418246">
+      <screen x="0" y="0" width="1536" height="824" />
+    </state>
+    <state width="1493" height="210" key="GridCell.Tab.0.left/0.0.1536.824@0.0.1536.824" timestamp="1593457418246" />
+    <state width="1493" height="210" key="GridCell.Tab.0.right" timestamp="1593457418246">
+      <screen x="0" y="0" width="1536" height="824" />
+    </state>
+    <state width="1493" height="210" key="GridCell.Tab.0.right/0.0.1536.824@0.0.1536.824" timestamp="1593457418246" />
+    <state x="107" y="201" key="com.intellij.ide.util.TipDialog" timestamp="1593723763226">
+      <screen x="0" y="0" width="1536" height="824" />
+    </state>
+    <state x="107" y="201" key="com.intellij.ide.util.TipDialog/0.0.1536.824@0.0.1536.824" timestamp="1593723763226" />
+    <state x="209" y="33" key="new project wizard" timestamp="1593723788909">
+      <screen x="0" y="0" width="1536" height="824" />
+    </state>
+    <state x="209" y="33" key="new project wizard/0.0.1536.824@0.0.1536.824" timestamp="1593723788909" />
+  </component>
+</project>
\ No newline at end of file

JTankTrouble.iml

+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file

src/UI/InitialFrame.java

+package UI;
+
+import javax.swing.*;
+
+public class InitialFrame extends JFrame {
+
+    private MainInitialPanel mainInitialPanel;
+
+    public InitialFrame(String title) {
+        super(title);
+        mainInitialPanel = new MainInitialPanel();
+        add(mainInitialPanel);
+    }
+}

src/UI/Main.java

+package UI;
+
+import javax.swing.*;
+
+public class Main {
+    public static void main (String [] args){
+        InitialFrame initialFrame = new InitialFrame("tank trouble");
+        initialFrame.setLocation(200,200);
+        initialFrame.setSize(400, 400);
+        initialFrame.setVisible(true);
+        initialFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
+    }
+}

src/UI/MainFrame.java

+package UI;
+
+import javax.swing.*;
+
+public class MainFrame extends JFrame {
+    public MainFrame (){
+        MainPanel mainPanel = new MainPanel();
+        this.add(mainPanel);
+        this.pack();
+    }
+}

src/UI/MainInitialPanel.java

+package UI;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+
+public class MainInitialPanel extends JPanel{
+
+    public MainInitialPanel(){
+        initComponents();
+    }
+
+    public void initComponents(){
+        JTextField gottenSecretCode = new JTextField();
+        gottenSecretCode.setPreferredSize(new Dimension(gottenSecretCode.getWidth()+200 , gottenSecretCode.getHeight()+30));
+        JButton logInBtn = new JButton("log in");
+        JButton regBtn = new JButton("sign up");
+        logInBtn.addMouseListener(new MouseAdapter() {
+            @Override
+            public void mouseClicked(MouseEvent e) {
+                super.mouseClicked(e);
+                if (true){
+                    MainFrame mainFrame = new MainFrame();
+                    mainFrame.setVisible(true);
+                }
+                else {
+                    JOptionPane.showMessageDialog(logInBtn,"error");
+                }
+            }
+        });
+
+        regBtn.addMouseListener(new MouseAdapter() {
+            @Override
+            public void mouseClicked(MouseEvent e) {
+                super.mouseClicked(e);
+                JFrame registration =  new JFrame();
+                registration.add(setRegistrationPanel());
+                registration.setVisible(true);
+            }
+        });
+
+        this.setLayout(new GridLayout(4,1));
+        add(setUserNamePanel());
+        add(setPassPanel());
+        add(logInBtn);
+        add(regBtn);
+    }
+
+    private JPanel setUserNamePanel(){
+        JPanel userNamePanel = new JPanel();
+        JLabel label = new JLabel("user name");
+        JTextField userName = new JTextField();
+        userName.setPreferredSize(new Dimension(userName.getWidth() + 200,userName.getHeight()+ 30));
+        userNamePanel.add(label);
+        userNamePanel.add(userName);
+        return userNamePanel;
+    }
+
+    private JPanel setPassPanel(){
+        JPanel passPanel = new JPanel();
+        JLabel label = new JLabel("password");
+        JTextField pass = new JTextField();
+        pass.setPreferredSize(new Dimension(pass.getWidth() + 200,pass.getHeight()+ 30));
+        passPanel.add(label);
+        passPanel.add(pass);
+        return passPanel;
+    }
+
+    private JPanel setRegistrationPanel(){
+        JPanel regPanel = new JPanel();
+        JPanel fieldsPanel = new JPanel(new GridLayout(4,2));
+        JLabel tankNameLabel = new JLabel("Name your tank");
+        JTextField tankName = new JTextField();
+        JLabel password = new JLabel("password");
+        JTextField passwordField = new JTextField();
+        JLabel passwordRp = new JLabel("password");
+        JTextField passwordRepField = new JTextField();
+        JLabel email = new JLabel("Email address");
+        JTextField emailField = new JTextField();
+        JButton saveBtn = new JButton("sign up");
+        fieldsPanel.add(tankNameLabel);
+        fieldsPanel.add(tankName);
+        fieldsPanel.add(password);
+        fieldsPanel.add(passwordField);
+        fieldsPanel.add(passwordRp);
+        fieldsPanel.add(passwordRepField);
+        fieldsPanel.add(email);
+        fieldsPanel.add(emailField);
+        regPanel.add(fieldsPanel);
+        regPanel.add(saveBtn);
+        return regPanel;
+    }
+}

src/UI/MainPanel.java

+package UI;
+
+import javax.swing.*;
+
+public class MainPanel extends JPanel {
+}