Add docker-compose for mongodb

DOCKER_SETUP.md

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+# Docker Setup for Recipe Management App
+
+## MongoDB Configuration
+
+This project now includes a Docker Compose setup for MongoDB with persistent storage.
+
+### Environment Variables
+
+Create a `.env` file in the `backend/` directory with the following variables:
+
+```
+# MongoDB Configuration (parameterized for security)
+MONGODB_USERNAME=admin
+MONGODB_PASSWORD=password123
+MONGODB_HOST=localhost
+MONGODB_PORT=27017
+MONGODB_DATABASE=recipe-management
+
+# Alternative: Use full connection string (overrides individual parameters)
+# MONGODB_URI=mongodb://admin:password123@localhost:27017/recipe-management?authSource=admin
+
+# Server Configuration
+PORT=5000
+```
+
+**Note**: The application will automatically construct the MongoDB URI from the individual parameters. You can also override this by setting `MONGODB_URI` directly.
+
+### Starting the Services
+
+1. Start MongoDB and Mongo Express:
+```bash
+docker-compose up -d
+```
+
+2. Start the backend application:
+```bash
+cd backend
+npm start
+```
+
+### Services Included
+
+- **MongoDB**: Database server on port 27017 with persistent volume
+- **Mongo Express**: Web-based MongoDB admin interface on port 8081
+
+### Default Credentials
+
+- **MongoDB Admin User**: admin
+- **MongoDB Admin Password**: password123
+- **Database Name**: recipe-management
+
+### Accessing Services
+
+- **Mongo Express**: http://localhost:8081
+- **Backend API**: http://localhost:5000
+
+### Data Persistence
+
+MongoDB data is stored in a Docker volume named `mongodb_data` which persists between container restarts.
+
+### Seed Data
+
+The seed data from `backend/seedData.js` is automatically loaded when the MongoDB container starts for the first time.