README.md added

README.md

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+# ✨ Full Stack Realtime Chat App ✨
+
+![Demo App](/frontend/public/screenshot-for-readme.png)
+
+[Video Tutorial on Youtube](https://youtu.be/ntKkVrQqBYY)
+
+Highlights:
+
+- 🌟 Tech stack: MERN + Socket.io + TailwindCSS + Daisy UI
+- 🎃 Authentication && Authorization with JWT
+- 👾 Real-time messaging with Socket.io
+- 🚀 Online user status
+- 👌 Global state management with Zustand
+- 🐞 Error handling both on the server and on the client
+- ⭐ At the end Deployment like a pro for FREE!
+- ⏳ And much more!
+
+### Setup .env file
+
+```js
+MONGODB_URI=...
+PORT=5001
+JWT_SECRET=...
+
+CLOUDINARY_CLOUD_NAME=...
+CLOUDINARY_API_KEY=...
+CLOUDINARY_API_SECRET=...
+
+NODE_ENV=development
+```
+
+### Build the app
+
+```shell
+npm run build
+```
+
+### Start the app
+
+```shell
+npm start
+```