- Introduction on base view model and stateless widget classes

- Implementation of firebase
- Implementation of dependency injection

Took 11 hours 26 minutes

lib/viewmodels/UserAuthViewModel.dart

@@ -0,0 +1,16 @@
+import 'package:days_left/data/FirebaseAuthData.dart';
+import '../base/BaseModel.dart';
+
+class UserAuthViewModel extends BaseModel {
+  bool _loggedIn = false;
+  bool get loggedIn => _loggedIn;
+
+  FirebaseAuthData _firebaseAuthData;
+  UserAuthViewModel(this._firebaseAuthData){
+    _firebaseAuthData.firebaseAuth.authStateChanges().listen((event) {
+      _loggedIn = event != null;
+      notifyListeners();
+    });
+  }
+
+}