feature: add a new role tutorial assistant

examples/write_tutorial.py

@@ -0,0 +1,20 @@
+#!/usr/bin/env python3
+# _*_ coding: utf-8 _*_
+"""
+@Time    : 2023/9/4 21:40:57
+@Author  : Stitch-z
+@File    : tutorial_assistant.py
+"""
+import asyncio
+
+from metagpt.roles.tutorial_assistant import TutorialAssistant
+
+
+async def main():
+    topic = "Write a tutorial about MySQL"
+    role = TutorialAssistant(language="Chinese")
+    await role.run(topic)
+
+
+if __name__ == '__main__':
+    asyncio.run(main())