start READMEs for backend local dev (ZcashFoundation#36)

py/README.md

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+# Python
+
+Basic python setup.
+
+We use python 3.10 latest in production. Earlier versions might work.
+Install python 3.10 and virtualenv for your OS.
+
+> TODO: devcontainer!!
+
+You can add the py directory to your python path.
+In this directory:
+
+```sh
+export PYTHONPATH=`pwd`
+```
+
+Create a virtualenv:
+
+```sh
+virtualenv env
+# or
+virtualenv -p `which python3` env
+```
+
+Enter the virtualenv:
+
+```sh
+source env/bin/activate
+```
+
+Install the dependenncies:
+
+```sh
+pip install -r requirements.txt
+```

py/dj/free2z/README.md

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+# Free2Z backend
+
+Make sure you have followed the [python setup instructions](../../README.md)
+to setup your local python environment.
+
+You can use sqlite to develop locally:
+
+```sh
+./manage.py migrate
+```
+
+Create a superuser:
+
+```sh
+./manage.py createsuperuser
+```
+
+In local dev, without the RECAPTCHA secret setup,
+you can go to http://localhost:8000/adminzzz/ to login
+and then you should be logged in to the frontend on
+http://locahost:3000/profile.