Update CONTRIBUTING.md

CONTRIBUTING.md

@@ -18,6 +18,51 @@ sudo apt-get install cmake
 sudo dnf install cmake
 ```
 
+## Getting Started
+
+```bash
+git clone https://github.com/LibreTranslate/LibreTranslate.git
+cd LibreTranslate
+pip install -e .
+libretranslate [args]
+
+# Or
+python main.py [args]
+```
+
+Then open a web browser to <http://localhost:5000>
+
+## Run with Docker
+
+Linux/macOS: `./run.sh [args]`
+Windows: `run.bat [args]`
+
+Then open a web browser to <http://localhost:5000>
+
+## Build with Docker
+
+```bash
+docker build -f docker/Dockerfile [--build-arg with_models=true] -t libretranslate .
+```
+
+If you want to run the Docker image in a complete offline environment, you need to add the `--build-arg with_models=true` parameter. Then the language models are downloaded during the build process of the image. Otherwise, these models get downloaded on the first run of the image/container.
+
+Run the built image:
+
+```bash
+docker run -it -p 5000:5000 libretranslate [args]
+```
+
+Or build and run using Docker Compose:
+
+```bash
+docker compose up -d --build
+```
+
+> Feel free to change the [`docker-compose.yml`](https://github.com/LibreTranslate/LibreTranslate/blob/main/docker-compose.yml) file to adapt it to your deployment needs, or use an extra `docker-compose.prod.yml` file for your deployment configuration.
+>
+> The models are stored inside the container under `/home/libretranslate/.local/share` and `/home/libretranslate/.local/cache`. Feel free to use volumes if you do not want to redownload the models when the container is destroyed. To update the models, use the `--update-models` argument.
+
 ## FAQ
 
 ### Externally Managed Environment