connect with backend

lib/screens/chat_screen.dart

@@ -0,0 +1,12 @@
+import 'package:flutter/material.dart';
+
+class ChatScreen extends StatelessWidget {
+  const ChatScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const Center(
+      child: Text("Invoice Content He", style: TextStyle(fontSize: 18)),
+    );
+  }
+}