Add OfflineModeFrame class.

src/OfflineModeFrame.java

+import javax.swing.*;
+import java.awt.*;
+
+public class OfflineModeFrame extends JFrame {
+
+    private ImageIcon deathMatchIcon;
+    private ImageIcon leagueIcon;
+    private JButton deathMatchButton;
+    private JButton leagueButton;
+
+
+    public OfflineModeFrame(String title) {
+
+        super(title);
+        setResizable(false);
+        setLayout(new FlowLayout());
+        setBounds(650, 450, 400, 165);
+
+        deathMatchIcon = new ImageIcon("pictures/deathMatch.png");
+        leagueIcon = new ImageIcon("pictures/league.png");
+        deathMatchButton = new JButton(deathMatchIcon);
+        leagueButton = new JButton(leagueIcon);
+
+        add(deathMatchButton);
+        add(leagueButton);
+        setVisible(true);
+
+
+    }
+}