docs: add Docker quickstart guide

docker/docs_docker-quickstart_Version2.md

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+# Running Doccano with Docker
+
+This guide explains how to run doccano using Docker and Docker Compose, including the steps needed to ensure export functionality.
+
+## 1. Clone the Repository
+
+```bash
+git clone https://github.com/doccano/doccano.git
+cd doccano
+```
+
+## 2. Build and Start the Containers
+
+```bash
+docker compose -f docker/docker-compose.yml up --build
+```
+
+This will start:
+- The Django backend
+- The frontend UI
+- The Celery worker (required for export)
+- Redis (for task queue)
+
+## 3. Access the Web UI
+
+Open [http://localhost:8000](http://localhost:8000) in your browser.
+
+## 4. Create a Superuser
+
+In a new terminal, run:
+```bash
+docker compose -f docker/docker-compose.yml exec backend python manage.py createsuperuser
+```
+
+## 5. Use Doccano
+
+- Log in with your superuser credentials.
+- Create a project, import data, annotate, and export.
+
+## 6. Stopping Doccano
+
+To stop all services:
+```bash
+docker compose -f docker/docker-compose.yml down
+```
+
+---
+
+## Troubleshooting
+
+- **Export not working?**  
+  The Celery worker must be running (it is included in the default Docker Compose setup).  
+  If you see no exported file, check the logs of the `worker` service:
+  ```bash
+  docker compose -f docker/docker-compose.yml logs worker
+  ```
+- **Persistent data:**  
+  By default, the database is stored in a Docker volume for persistence between runs.
+
+---
+
+## References
+
+- [Django backend (source)](https://github.com/doccano/doccano/tree/master/backend)
+- [Frontend (source)](https://github.com/doccano/doccano/tree/master/frontend)
+- [Original README](../README.md)