Add docker compose to readme

Author: matthieubosquet

README.md

@@ -9,3 +9,5 @@ These docs are generated using [MkDocs](https://www.mkdocs.org/).
 You can contribute to it by submitting a PR to this repository.
 
 If you use VSCode, you can [open this repo in a dev container](https://code.visualstudio.com/docs/devcontainers/containers#_quick-start-open-an-existing-folder-in-a-container), it will build and serve the docs on localhost:8000 and watch for any changes.
+
+Alternatively you can run `docker compose up` and browser to [localhost:8000](http://localhost:8000).