add: WhatsApp, Slack and Telegram bots (#438)

docs/examples/telegram_bot.mdx

@@ -0,0 +1,26 @@
+---
+title: '📱 Telegram Bot'
+---
+
+### 🖼️ Template Setup
+
+- Fork [this](https://replit.com/@taranjeetio/EC-Telegram-Bot-Template?v=1#README.md) replit template.
+- Set your `OPENAI_API_KEY` in Secrets.
+- Open the Telegram app and search for the `BotFather` user.
+- Start a chat with BotFather and use the `/newbot` command to create a new bot.
+- Follow the instructions to choose a name and username for your bot.
+- Once the bot is created, BotFather will provide you with a unique token for your bot.
+- Set this token as `TELEGRAM_BOT_TOKEN` in Secrets.
+- Click on `Run` in the replit container and a URL will get generated for your bot.
+- Now set your webhook by running the following link in your browser:
+```url
+https://api.telegram.org/bot<Your_Telegram_Bot_Token>/setWebhook?url=<Replit_Generated_URL>
+```
+- When you get a successful response in your browser, your bot is ready to be used.
+
+### 🚀 Usage Instructions
+
+- Open your bot by searching for it using the bot name or bot username.
+- Click on `Start` or type `/start` and follow the on screen instructions.
+
+🎉 Happy Chatting! 🎉