Add Dynamic Status Badges to README

We should enhance the project’s README by adding a set of dynamic badges that reflect the real-time status of MGCI. These badges will improve visibility of pipeline health, latest release, license and overall activity.

Proposed Badges

1. CI Pipeline

   [![CI Pipeline](https://lab.frogg.it/gl-test-import/froggit/tools/mgci/badges/main/pipeline.svg)](https://lab.frogg.it/gl-test-import/froggit/tools/mgci/pipelines)

2. Latest Release

   [![Latest Release](https://img.shields.io/gitlab/v/release/froggit/tools/mgci?sort=semver)](https://gitlab.com/froggit/tools/mgci/-/releases)

3. License (GPL-3.0)

   [![GPLv3](https://www.gnu.org/graphics/gplv3-with-text-136x68.png)](https://choosealicense.com/licenses/gpl-3.0/)

4. Project Activity

   [![Last commit](https://img.shields.io/github/last-commit/froggit/tools/mgci)](https://lab.frogg.it/gl-test-import/froggit/tools/mgci/-/commits/main)

5. Configure me

   [![Configure me](https://img.shields.io/badge/configure-me)](/-/commits/main)

References

• GitLab custom badges: https://docs.gitlab.com/ee/user/project/badges.html#custom-badges
• Shields.io endpoint schema: https://shields.io/endpoint

Acceptance Criteria

• README.md updated with at least 3 of the above badges.
• Each badge links correctly to its target (pipelines, releases, JSON endpoint).
• Documentation updated to explain how to add or modify badges.