Added an initial loading screens where the status of the user is checked (logged in or not) and added a dummy home screen to implement the redirectioning of a user in case his logged in already

lib/src/App.dart

@@ -1,16 +1,41 @@
 import 'package:flutter/material.dart';
+
+import 'screens/home_screen.dart';
 import 'screens/login_screen.dart';
+import 'screens/initial_loading_screen.dart';
 
 class App extends StatelessWidget {
   Widget build(BuildContext context) {
     return MaterialApp(
       title: 'Do more',
       //home: Text('Start'),
-      home: LoginScreen(),
+      onGenerateRoute: routes,
       theme: ThemeData(
         canvasColor: Color.fromRGBO(23, 25, 29, 1.0),
         fontFamily: 'IBM Plex Sans',
       ),
     );
   }
+
+  Route routes(RouteSettings settings) {
+    final List<String> routeTokens = settings.name.split('/');
+
+    if (settings.name == '/') {
+      return MaterialPageRoute(
+        builder: (BuildContext context) {
+          return InitialLoadingScreen();
+        },
+      );
+    } else if (routeTokens.first == 'login') {
+      return MaterialPageRoute(
+        builder: (BuildContext context) {
+          return LoginScreen();
+        },
+      );
+    } else if (routeTokens.first == 'home') {
+      return MaterialPageRoute(builder: (BuildContext context) {
+        return HomeScreen();
+      });
+    }
+  }
 }