对话页面新增，实现最最基础的部分

lib/pages/chat/chat_test.dart

@@ -0,0 +1,15 @@
+import 'package:flutter/material.dart';
+import 'index.dart';
+
+void main() => runApp(const MyChatTestApp());
+
+class MyChatTestApp extends StatelessWidget {
+  const MyChatTestApp({super.key});
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      debugShowCheckedModeBanner: false,
+      home: const ChatPage(),
+    );
+  }
+}