added docker file

README.md

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+## Running the Project with Docker
+
+This project consists of four services, each with its own Dockerfile and environment configuration. All services are orchestrated using Docker Compose for local development and testing.
+
+### Project-Specific Requirements
+- **Node.js Version:** All services use Node.js `22.13.1-slim` (set via `ARG NODE_VERSION=22.13.1` in Dockerfiles).
+- **System Dependencies:**
+  - `openssl` is installed in the database services for Prisma and bcrypt support.
+- **Non-root Users:** All containers run as non-root users for improved security.
+
+### Environment Variables
+- Each service requires its own `.env` file, referenced in the `docker-compose.yml` via the `env_file` directive:
+  - `./assignment-db-service/.env`
+  - `./assignment-service/.env`
+  - `./auth-service/.env`
+  - `./user-db-service/.env`
+- Ensure these files are present and populated with the required variables before starting the services.
+
+### Build and Run Instructions
+1. **Clone the repository and ensure all subdirectories and `.env` files are present.**
+2. **Build and start all services:**
+   ```sh
+   docker compose up --build
+   ```
+   This will build all images and start the containers as defined in `docker-compose.yml`.
+
+### Service Ports
+- **assignment-db-service:**
+  - Exposes port **3000** (host: 3000 → container: 3000)
+- **assignment-service:**
+  - Exposes port **8080** (host: 8080 → container: 8080)
+- **auth-service:**
+  - Exposes port **8081** (host: 8081 → container: 8080)
+- **user-db-service:**
+  - Exposes port **3001** (host: 3001 → container: 3000)
+
+### Special Configuration
+- All services are connected to a shared Docker network named `backend` for internal communication.
+- The `assignment-service` depends on `assignment-db-service` and will wait for it to be available before starting.
+- Prisma client is generated during the build process for database services.
+
+---
+
+*Ensure you have Docker and Docker Compose installed on your system before proceeding.*