feat:增加博客分类模块

lib/layout/menu.dart

@@ -0,0 +1,16 @@
+import 'package:flutter/material.dart';
+
+class PageInfo {
+  final String title;
+  final IconData icon;
+
+  const PageInfo({required this.title, required this.icon});
+}
+
+final List<PageInfo> pages = [
+  PageInfo(title: '博客', icon: Icons.article),
+  PageInfo(title: '分类', icon: Icons.folder),
+  PageInfo(title: '个人中心', icon: Icons.person),
+  PageInfo(title: '设置', icon: Icons.settings),
+  PageInfo(title: '关于我们', icon: Icons.info),
+];