- Introduction on base view model and stateless widget classes

- Implementation of firebase
- Implementation of dependency injection

Took 11 hours 26 minutes

lib/base/BaseModel.dart

@@ -0,0 +1,41 @@
+import 'dart:async';
+
+import 'package:days_left/data/ViewState.dart';
+import 'package:stacked/stacked.dart';
+
+class BaseModel extends BaseViewModel {
+  ViewState _viewState = Idle();
+
+  ViewState get viewState => _viewState;
+
+  void onStart() {
+    _viewState = HasStarted();
+    notifyListeners();
+  }
+
+  void onSuccess(dynamic data) {
+    _viewState = HasData(data);
+    notifyListeners();
+  }
+
+  void onError(String error) {
+    _viewState = HasError(error);
+    notifyListeners();
+  }
+
+  void handleFuture(Future<dynamic> func) {
+    onStart();
+    func.then((value) => onSuccess(value)).catchError((error) {
+      print(error);
+      onError(error);
+    });
+  }
+
+  void handleStream(Stream<dynamic> stream) {
+    stream.listen((event) {
+      onSuccess(event);
+    }).onError((handleError) {
+      onError(handleError);
+    });
+  }
+}