Add requirements.

requirements.in/base.txt

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+django
+django-allauth
+django-anymail
+django-appconf
+django-cors-headers
+django-debug-toolbar
+django-fullurl
+django-ipware
+djangorestframework
+drf-nested-routers
+psycopg2-binary

requirements.in/development.txt

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+coverage
+pip-tools

requirements.txt

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+#
+# This file is autogenerated by pip-compile
+# To update, run:
+#
+#    pip-compile --output-file=requirements.txt requirements.in/base.txt
+#
+asgiref==3.2.3            # via django
+certifi==2019.11.28       # via requests
+chardet==3.0.4            # via requests
+defusedxml==0.6.0         # via python3-openid
+django-allauth==0.41.0
+django-anymail==7.0.0
+django-appconf==1.0.3
+django-cors-headers==3.2.1
+django-debug-toolbar==2.2
+django-fullurl==1.0
+django-ipware==2.1.0
+django==3.0.3
+djangorestframework==3.11.0
+drf-nested-routers==0.91
+idna==2.8                 # via requests
+oauthlib==3.1.0           # via requests-oauthlib
+psycopg2-binary==2.8.4
+python3-openid==3.1.0     # via django-allauth
+pytz==2019.3              # via django
+requests-oauthlib==1.3.0  # via django-allauth
+requests==2.22.0          # via django-allauth, django-anymail, requests-oauthlib
+six==1.14.0               # via django-anymail, django-appconf
+sqlparse==0.3.0           # via django, django-debug-toolbar
+urllib3==1.25.8           # via requests