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

docs/examples/slack_bot.mdx

@@ -0,0 +1,39 @@
+---
+title: '💼 Slack Bot'
+---
+
+### 🖼️ Template Setup
+
+- Fork [this](https://replit.com/@taranjeetio/EC-Slack-Bot-Template?v=1#README.md) replit template.
+- Set your `OPENAI_API_KEY` in Secrets.
+- Create a workspace on Slack if you don't have one already by clicking [here](https://slack.com/intl/en-in/).
+- Create a new App on your Slack account by going [here](https://api.slack.com/apps).
+- Select `From Scratch`, then enter the Bot Name and select your workspace.
+- On the `Basic Information` page copy the `Signing Secret` and set it in your secrets as `SLACK_SIGNING_SECRET`.
+- On the left Sidebar, go to `OAuth and Permissions` and add the following scopes under `Bot Token Scopes`:
+```text
+app_mentions:read
+channels:history
+channels:read
+chat:write
+```
+- Now select the option `Install to Workspace` and after it's done, copy the `Bot User OAuth Token` and set it in your secrets as `SLACK_BOT_TOKEN`.
+- Start your replit container now by clicking on `Run`.
+- On the Slack API website go to `Event Subscriptions` on the left Sidebar and turn on `Enable Events`.
+- Copy the generated server URL in replit, append `/chat` at its end and paste it in `Request URL` box.
+- After it gets verified, click on `Subscribe to bot events`, add `message.channels` Bot User Event and click on `Save Changes`.
+- Now go to your workspace, click on the bot name in the Sidebar and then add the bot to any channel you want.
+
+### 🚀 Usage Instructions
+
+- Go to the channel where you have added your bot.
+- 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
+query <question>
+```
+
+🎉 Happy Chatting! 🎉