How login, register and log out Firebase. Textformfield with focusNode InheritedWidget exam. Stream provider usage.
To use this package :
add the dependency to your pubspec.yaml file.
provider: ^5.0.0 firebase_core: ^1.1.0 cloud_firestore: ^2.0.0 firebase_auth: ^1.1.3
paste it in the specified path android\app\build.gradle
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