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();
+      });
+    }
+  }
 }

lib/src/screens/home_screen.dart

@@ -0,0 +1,12 @@
+import 'package:flutter/material.dart';
+
+class HomeScreen extends StatelessWidget {
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text('Main Screen'),
+      ),
+      body: Text('Tasks go here'),
+    );
+  }
+}

lib/src/screens/initial_loading_screen.dart

@@ -0,0 +1,15 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/cupertino.dart';
+
+class InitialLoadingScreen extends StatelessWidget {
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: Container(
+        color: Theme.of(context).canvasColor,
+        child: Center(
+          child: CupertinoActivityIndicator(),
+        ),
+      ),
+    );
+  }
+}