Add requirements for backend

Author: ankan17

backend/requirements.txt

@@ -0,0 +1,26 @@
+asgiref==3.2.7
+certifi==2020.4.5.1
+cffi==1.14.0
+chardet==3.0.4
+cryptography==2.9.2
+defusedxml==0.6.0
+Django==3.0.6
+django-braces==1.14.0
+django-cors-headers==3.2.1
+django-oauth-toolkit==1.3.2
+django-rest-framework-social-oauth2==1.1.0
+djangorestframework==3.11.0
+idna==2.9
+oauthlib==3.1.0
+pycparser==2.20
+PyJWT==1.7.1
+python-decouple==3.3
+python3-openid==3.1.0
+pytz==2020.1
+requests==2.23.0
+requests-oauthlib==1.3.0
+six==1.14.0
+social-auth-app-django==3.1.0
+social-auth-core==3.3.3
+sqlparse==0.3.1
+urllib3==1.25.9