Update README.md

Author: PierreMarza

README.md

@@ -7,6 +7,8 @@
 
 [![Python application](https://github.com/MICS-lab/thunder/actions/workflows/ci.yml/badge.svg)](https://github.com/MICS-lab/thunder/actions/workflows/ci.yml)
 [![Docs](https://img.shields.io/badge/docs-mkdocs-blue)](https://mics-lab.github.io/thunder/)
+[![License](https://img.shields.io/badge/License-CC%20BY%204.0-lightgrey.svg)](https://github.com/MICS-Lab/thunder/blob/main/LICENSE)
+[![Black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://black.readthedocs.io/en/stable/)
 
 </div>