send emails to new user upon sign in

[JordyHers]

Current Behaviour:

The user does not receive anything when he signs up.

Expected Behaviour:

Each new user should receive a welcome email when he signs in. Create cloud functions to send emails.

Steps to Reproduce:

NO/

Environment:

Emulator:
Android version:
Android SDK:

[sahil-banswani]

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[JordyHers]

@sahil-banswani in progress