Update README.md

Author: pH-7

README.md

@@ -1 +1,33 @@
 # TypeScript Backend
+
+## 3-Hour Full Course
+[![Watch the video](https://i1.ytimg.com/vi/3xBPCwZAN7w/maxresdefault.jpg)](https://youtu.be/3xBPCwZAN7w)
+
+👉 **[Click Here to watch on YouTube](https://youtu.be/3xBPCwZAN7w)**, me building the NodeJS App from ZERO (with AI) 
+
+
+## Installation
+
+```bash
+$ yarn install
+```
+
+
+### Setup
+1. As mentioned in [the video](https://youtu.be/3xBPCwZAN7w), create an account at [MongoDB Atlas](https://www.mongodb.com/atlas/database)
+2. Rename `.env.sample` file to `.env`
+3. Then, open `.env` and update the database credentials with yours.
+
+
+## Running the app
+
+```bash
+# development
+$ yarn run start
+
+# watch mode
+$ yarn run start:dev
+
+# production mode
+$ yarn run start:prod
+