add requirements for setting up python environment

requirements.txt

@@ -0,0 +1,12 @@
+certifi==2020.12.5
+chardet==4.0.0
+click==7.1.2
+Flask==1.1.2
+idna==2.10
+itsdangerous==1.1.0
+Jinja2==2.11.3
+MarkupSafe==1.1.1
+requests==2.25.1
+urllib3==1.26.4
+Werkzeug==1.0.1
+flake8==3.9.0