Flutter - Wire up the Firebase Auth for iOS

This video covers:

- Create a firebase app
- Configure iOS for Google services
- Import Google Sign-In & Firebase Auth plugins
- Wire up the sign in

Firebase Console:
https://console.firebase.google.com/

Google Sign-In Plugin
https://pub.dartlang.org/packages/google_sign_in

Firebase Auth Plugin Source
https://pub.dartlang.org/packages/firebase_auth

Firebase Auth Plugin Example
https://github.com/flutter/plugins/blob/master/packages/firebase_auth/example/

Google Sign In Plugin Example IOS Runner(App)
https://github.com/flutter/plugins/tree/master/packages/firebase_auth/example/ios/Runner