Added README

Author: aswinrajeevofficial

rest-api/talkjs-zoom-integration/README.md

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+This is an example project for integrating Zoom with TalkJS.
+
+The project uses TalkJS's [custom headers](https://talkjs.com/docs/Features/Customizations/Creating_Custom_Headers/) to add a new header with a button to start Zoom meetings from the chat. The button is hooked to a backend server that calls the Zoom API to create a meeting and also sends a message to the chat with the details of the meeting.
+
+## Prerequisites
+
+To run this tutorial, you will need:
+
+- A [TalkJS account](https://talkjs.com/dashboard/login)
+- A [Zoom account](https://zoom.us/signup)
+- [Node.js](https://nodejs.org/en)
+
+## How to run the tutorial
+
+1. Clone or download this project.
+2. Go to the `server` folder and run `npm start`. This starts the NodeJS server.
+3. Open `index.html` from a browser, or through an extension like Live Server from your favorite IDE or text editor.