Authentication Flow

[jeremyscatigna]

Here the goal is to create the Authentication flow using: https://github.com/cristicretu/Layers

When launching the app the flow is:

1. Check if user is signed In
2. If signedIn go to Home
3. else go to Authentication screen
4. The authentication screen have 2 buttons: Sign in and Sign up
5. If Sign in it opens the Signin flow in Layers
6. If Sign up it opens the Signup flow in Layers
7. Once Authenticated go to Home