docs: update readme

backend/README.md

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+**GG-Node-Backend**
+
+## Tech Stack
+
+Runtime: Node.js (ES Modules)
+Framework: Express.js (v5.x)
+ORM: Prisma (PostgreSQL)
+Storage: Bytescale (Image uploads)
+Auth: JSON Web Tokens (JWT) & Bcrypt
+Email: Postmark
+
+## Project Structure
+
+backend/
+├── prisma/
+│ └── schema.prisma  
+├──── src/
+│ ├── app.js  
+│ ├── controllers/  
+│ ├── middlewares/  
+│ ├── routes/  
+│ ├── prisma/  
+│ └── utils/  
+├── .env  
+└── package.json
+
+## Installation & Setup
+
+**1. Prerequisites**
+Node.js (v18+)
+PostgreSQL Database
+
+**2. Environment Variables**
+DATABASE_URL=""
+PORT=3000
+JWT_SECRET=""
+CORS_ALLOWED_ORIGINS=http://localhost:3001 http://localhost:3003 http://localhost:5174 http://localhost:5173
+BYTESCALE_SECRET_API_KEY=""
+POSTMARK_API_KEY=""
+
+**3. Install Dependencies**
+npm install
+
+**4. Database Initialization**
+
+# Generate Prisma Client
+
+npm run generate
+
+# Run migrations to create database tables
+
+npm run migrate
+
+## Scripts
+
+1. npm start: Runs the server in production mode.
+2. npm run migrate: Syncs your local database with the current Prisma schema.
+3. npm run generate: Regenerates the Prisma Client (run this after schema changes).
+4. npx prisma studio: Opens a visual editor to view and manage your database data.