Add RainEggplant/chatgpt-telegram-bot to readme.md

This bot utilizes the latest API to bypass Cloudflare's security measures. Its features include:
- Support for both private and group chats
- Work in privacy mode (the bot can only see specific messages)
- Authentication based on user and group IDs
- Reset chat thread and refresh session with command
- Typing indicator, Markdown formatting, ...
- User-friendly logging

legacy/readme.md

@@ -315,6 +315,7 @@ All of these awesome projects are built using the `chatgpt` package. 🤯
 - [Telegram Bot #2](https://github.com/dawangraoming/chatgpt-telegram-bot)
 - [Deno Telegram Bot](https://github.com/Ciyou/chatbot-telegram)
 - [Go Telegram Bot](https://github.com/m1guelpf/chatgpt-telegram)
+- [Telegram Bot #5](https://github.com/RainEggplant/chatgpt-telegram-bot) (group privacy mode, ID-based auth)
 - [GitHub ProBot](https://github.com/oceanlvr/ChatGPTBot)
 - [Discord Bot #1](https://github.com/onury5506/Discord-ChatGPT-Bot)
 - [Discord Bot #2](https://github.com/Nageld/ChatGPT-Bot)