Friends fragment

[piotrpdev]

https://stackoverflow.com/q/46939765/19020549

Using Admin SDK in app seems like a security risk. Either:

1. Create a Lambda/Google Function to fetch users using Admin SDK, then call that from the app.

OR

2. Create a Google Function that triggers when a new user registers, and have it save their ID and some details to the database.

Include setup for function e.g. service account, function version, firebase auth oncreate trigger etc.