add flutter

ontime_merchant_flutter/lib/main.dart

@@ -0,0 +1,21 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import 'core/app_router.dart';
+import 'core/app_theme.dart';
+import 'core/fcm_service.dart';
+
+void main() async {
+  WidgetsFlutterBinding.ensureInitialized();
+  await FcmService.init();
+  runApp(
+    ProviderScope(
+      child: MaterialApp.router(
+        debugShowCheckedModeBanner: false,
+        title: 'Ontime Merchant',
+        theme: AppTheme.light(),
+        routerConfig: createAppRouter(),
+      ),
+    ),
+  );
+}