enhancement #35: add badge

Author: FabienDanieau

README.md

@@ -2,7 +2,7 @@
 
 Template code and examples for python project respecting the [PEP8 coding style](https://peps.python.org/pep-0008/).
 
-[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black) ![linter](https://github.com/pollen-robotics/python-coding-guidelines/actions/workflows/lint.yml/badge.svg) ![pytest](https://github.com/pollen-robotics/python-coding-guidelines/actions/workflows/pytest.yml/badge.svg) ![coverage](https://img.shields.io/endpoint?url=https://gist.githubusercontent.com/FabienDanieau/58642e8fe4589e710e26627e39ff92d7/raw/covbadge.json)
+[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black) ![linter](https://github.com/pollen-robotics/python-coding-guidelines/actions/workflows/lint.yml/badge.svg) ![pytest](https://github.com/pollen-robotics/python-coding-guidelines/actions/workflows/pytest.yml/badge.svg) ![coverage](https://img.shields.io/endpoint?url=https://gist.githubusercontent.com/FabienDanieau/58642e8fe4589e710e26627e39ff92d7/raw/covbadge.json) [![Licence](https://img.shields.io/badge/licence-Apache%202.0-blue)](LICENSE)
 
 
 ## Quick start