Add requirements file

requirements.txt

+asn1crypto==0.24.0
+Authlib==0.11
+certifi==2019.6.16
+cffi==1.12.3
+chardet==3.0.4
+Click==7.0
+cryptography==2.7
+Flask==1.1.1
+idna==2.8
+itsdangerous==1.1.0
+Jinja2==2.10.1
+MarkupSafe==1.1.1
+pycparser==2.19
+PyJWT==1.7.1
+pymongo==3.9.0
+requests==2.22.0
+six==1.12.0
+urllib3==1.25.3
+Werkzeug==0.15.5