lib/main_screen.dart

@@ -0,0 +1,22 @@
+import 'package:flutter/material.dart';
+
+class MainScreen extends StatefulWidget {
+  const MainScreen({ Key? key }) : super(key: key);
+
+  @override
+  _MainScreenState createState() => _MainScreenState();
+}
+
+class _MainScreenState extends State<MainScreen> {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text("Main Screen"),
+      ),
+      body: const Center(
+        child: Text("Main Screen"),
+      ),
+    );
+  }
+}