feat(compose): Add a README.md section explaining Conventional Commits usage (#10)

docker-compose/{{ cookiecutter.__project_slug }}/README.md

@@ -167,3 +167,33 @@ build-context/
 ```
 
 When done head back up to [How to run](#how-to-run).
+
+# Development
+
+## Conventional commits
+
+This project uses [Conventional Commits](https://www.conventionalcommits.org/) for its commit messages.
+
+### Commit types
+
+Commit _types_ besides `fix` and `feat` are:
+
+- `refactor`: Keeping functionality while streamlining or otherwise improving function flow
+- `docs`: Documentation for project or components
+
+### Commit scopes
+
+The following _scopes_ are known for this project. A Conventional Commits commit message may optionally use one of the following scopes or none:
+
+{%- if ',' in cookiecutter.__component_list_slug -%}
+{%- set components = cookiecutter.__component_list_slug.split(',') -%}
+{%- for component in components %}
+- `{{ component }}`: A change to how the `{{ component }}` service component works
+{%- endfor -%}
+{%- else %}
+- `{{ cookiecutter.__service_slug }}`: A change to how the `{{ cookiecutter.__service_slug }}` service component works
+{%- endif %}
+- `build`: Build-related changes such as `Dockerfile` fixes and features.
+- `mount`: Volume or bind mount-related changes.
+- `net`: Networking, IP addressing, routing changes
+- `meta`: Affects the project's repo layout, file names etc.