add requirements.txt file

[dkdndes]

To improve your tutorial, could you add the reference (or a requirements.txt) to the libraries for
a) sending push notifications:

• pip install pusher_push_notifications

b) saving, storage and login in python:

• pip install pyrebase

Its hard for a beginner to find things like this otherwise. Maybe a reference to the original reference helps, too.

• https://github.com/firebase/quickstart-python/tree/master/messaging