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

docs/examples/whatsapp_bot.mdx

@@ -0,0 +1,27 @@
+---
+title: '💬 WhatsApp Bot'
+---
+
+### 🖼️ Template Setup
+
+- Fork [this](https://replit.com/@taranjeetio/EC-WhatsApp-Bot-Template?v=1#README.md) replit template.
+- Set your `OPENAI_API_KEY` in Secrets.
+- Register for a free account on [Twilio](https://www.twilio.com/try-twilio) and create a new Whatsapp Sandbox.
+- You can find it in the left Sidebar under `Develop` by navigating to `Messaging>Try it out>Send a WhatsApp Message`.
+- To connect a phone number and allow it to chat with the bot, follow the on screen instructions.
+- Click on `Run` in the replit container and a URL will get generated for your bot.
+- Copy the URL, append `/chat` at the end and paste it under `When a message comes in` under the `Sandbox settings` for Whatsapp in Twilio. Save your settings.
+
+### 🚀 Usage Instructions
+
+- To allow a new number or reconnect an old number with the Sandbox, follow the instructions in your Twilio account.
+- To add data sources to the bot, use the command:
+```text
+add <data_type> <url_or_text>
+```
+- To ask queries from the bot, use the command:
+```text
+<question>
+```
+
+🎉 Happy Chatting! 🎉