docs: add CI/CD and deployment documentation

Added a new `README.md` under `.github` to document the project's CI/CD workflow and deployment setup. Includes GitHub Actions pipeline descriptions, Docker configuration details, environment variables, and production deployment considerations.

.github/README.md

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+# CI/CD and Deployment Documentation
+
+This directory contains the CI/CD configuration for the project.
+
+## CI/CD Workflow
+
+The CI/CD pipeline is configured using GitHub Actions and is defined in the `.github/workflows/ci-cd.yml` file. The workflow consists of the following steps:
+
+### Build and Test
+
+This job runs on every push to the main branch and on pull requests:
+
+1. Sets up Node.js and pnpm
+2. Installs dependencies
+3. Builds and tests the backend
+4. Builds and lints the frontend
+
+### Build and Push Docker Images
+
+This job runs only on pushes to the main branch:
+
+1. Sets up Docker Buildx
+2. Logs in to GitHub Container Registry
+3. Builds and pushes the backend Docker image
+4. Builds and pushes the frontend Docker image
+
+## Deployment
+
+The application is containerized using Docker. Dockerfiles are provided for both the backend and frontend:
+
+- `backend/Dockerfile`: Multi-stage build for the NestJS backend
+- `frontend/Dockerfile`: Multi-stage build for the Next.js frontend
+
+A `docker-compose.yml` file is also provided at the root of the project for local development and as a reference for deployment.
+
+### Running Locally with Docker Compose
+
+```bash
+# Build and start all services
+docker-compose up -d
+
+# View logs
+docker-compose logs -f
+
+# Stop all services
+docker-compose down
+```
+
+### Environment Variables
+
+The following environment variables are used in the deployment:
+
+#### Backend
+- `NODE_ENV`: Environment (development, production)
+- `PORT`: Port on which the backend runs
+- `POSTGRES_HOST`: PostgreSQL host
+- `POSTGRES_PORT`: PostgreSQL port
+- `POSTGRES_DB`: PostgreSQL database name
+- `POSTGRES_USER`: PostgreSQL username
+- `POSTGRES_PASSWORD`: PostgreSQL password
+
+#### Frontend
+- `NODE_ENV`: Environment (development, production)
+- `PORT`: Port on which the frontend runs
+- `NEXT_PUBLIC_API_URL`: URL of the backend API
+
+## Production Deployment Considerations
+
+For production deployment, consider the following:
+
+1. Use a proper secrets management solution for sensitive information
+2. Set up proper networking and security groups
+3. Configure a reverse proxy (like Nginx) for SSL termination
+4. Set up monitoring and logging
+5. Configure database backups