feat:增加菜单栏模块

lib/pages/about_page.dart

@@ -0,0 +1,62 @@
+import 'package:flutter/material.dart';
+
+class AboutPage extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return Center(
+      child: Column(
+        mainAxisAlignment: MainAxisAlignment.center,
+        children: [
+          FlutterLogo(size: 100),
+          SizedBox(height: 24),
+          Text(
+            '我的Flutter应用',
+            style: TextStyle(
+              fontSize: 28,
+              fontWeight: FontWeight.bold,
+              color: Colors.blue,
+            ),
+          ),
+          SizedBox(height: 8),
+          Text(
+            '版本 2.1.0',
+            style: TextStyle(fontSize: 16, color: Colors.grey),
+          ),
+          SizedBox(height: 32),
+          Container(
+            width: 200,
+            child: Column(
+              children: [
+                _buildAboutItem('编译版本', '2.1.0 (20240115)'),
+                _buildAboutItem('更新时间', '2024年1月15日'),
+                _buildAboutItem('开发者', 'Flutter开发团队'),
+              ],
+            ),
+          ),
+          SizedBox(height: 40),
+          ElevatedButton.icon(
+            onPressed: () {},
+            icon: Icon(Icons.star),
+            label: Text('给我们评分'),
+            style: ElevatedButton.styleFrom(
+              padding: EdgeInsets.symmetric(horizontal: 24, vertical: 12),
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+
+  Widget _buildAboutItem(String label, String value) {
+    return Padding(
+      padding: EdgeInsets.symmetric(vertical: 8),
+      child: Row(
+        mainAxisAlignment: MainAxisAlignment.spaceBetween,
+        children: [
+          Text(label, style: TextStyle(color: Colors.grey)),
+          Text(value, style: TextStyle(fontWeight: FontWeight.bold)),
+        ],
+      ),
+    );
+  }
+}