fix: add example

Author: demchenkoalex

packages/flyer_chat_text_stream_message/example/README.md

@@ -0,0 +1,65 @@
+```dart
+import 'dart:math';
+
+import 'package:flutter/material.dart';
+import 'package:flutter_chat_core/flutter_chat_core.dart';
+import 'package:flutter_chat_ui/flutter_chat_ui.dart';
+import 'package:flyer_chat_text_stream_message/flyer_chat_text_stream_message.dart';
+
+class Basic extends StatefulWidget {
+  const Basic({super.key});
+
+  @override
+  BasicState createState() => BasicState();
+}
+
+class BasicState extends State<Basic> {
+  final _chatController = InMemoryChatController();
+
+  @override
+  void dispose() {
+    _chatController.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: Chat(
+        builders: Builders(
+            textStreamMessageBuilder: (context, message, index) {
+              // To see a practical implementation of the stream manager, check the main example app at
+              // https://github.com/flyerhq/flutter_chat_ui/tree/main/examples/flyer_chat
+              final streamState = context.watch<GeminiStreamManager>().getState(
+                message.streamId,
+              );
+              // Return the stream message widget, passing the state
+              return FlyerChatTextStreamMessage(
+                message: message,
+                index: index,
+                streamState: streamState,
+              );
+            },
+        ),
+        chatController: _chatController,
+        currentUserId: 'user1',
+        onMessageSend: (text) {
+          _chatController.insert(
+            // For a comprehensive example of how to implement the stream manager and work with streamIds, refer to the main example application available at
+            // https://github.com/flyerhq/flutter_chat_ui/tree/main/examples/flyer_chat
+            TextStreamMessage(
+              id: streamId,
+              authorId: 'agent1',
+              createdAt: DateTime.now().toUtc(),
+              streamId: streamId,
+            )
+          );
+        },
+        resolveUser: (UserID id) async {
+          return User(id: id, name: 'John Doe');
+        },
+      ),
+    );
+  }
+}
+```