Added main file

src/main.dart

@@ -0,0 +1,21 @@
+import 'package:flutter/material.dart';
+
+void main() => runApp(const CipherDiskApp());
+
+class CipherDiskApp extends StatelessWidget {
+  const CipherDiskApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      // App bar with a title
+      appBar: AppBar(
+        backgroundColor: Colors.green,
+        title: const Text(
+          "GeeksforGeeks",
+          style: TextStyle(color: Colors.white),
+        ),
+      ),
+    );
+  }
+}