docs(getting-started): quick setup and detailed explanations

This documentation provides:

- a reminder of some CI concepts
- setup of the project with access token for repository write
  permission
- setup of the `.gitlab-ci.yml` with a full featured example and a
  step by step setup

README.md

@@ -85,6 +85,11 @@ graph LR
     ReleaseCI   -->|release| LatestDockerTag
 ```
 
+## Use the ci-tools to setup a new CI
+
+There is a dedicated [documentation to start using the `ci-tools`
+templates](docs/GETTING-STARTED.md) in your project.
+
 ## Contributing to this project
 
 ### Commit messages