feat(migrate): 将之前写好的部件迁移了过来

lib/app.dart

@@ -0,0 +1,25 @@
+import 'package:flutter/material.dart';
+import 'layout/LayoutScaffold.dart';
+
+///
+/// 应用页
+///
+class App extends StatefulWidget {
+  const App({Key? key}) : super(key: key);
+
+  @override
+  State<StatefulWidget> createState() => _AppState();
+}
+
+class _AppState extends State<App> {
+  @override
+  Widget build(BuildContext context) {
+    // TODO: implement build
+    return LayoutScaffold(
+      appBar: AppBar(
+        title: const Text('应用'),
+      ),
+      body: null,
+    );
+  }
+}