CI - tests

Author: forman

README.md

@@ -1,3 +1,7 @@
+[![CI](https://github.com/bcdev/xrlint/actions/workflows/tests.yml/badge.svg)](https://github.com/bcdev/xrlint/actions/workflows/tests.yml)
+[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
+[![GitHub License](https://img.shields.io/github/license/bcdev/xrlint)](https://github.com/bcdev/xrlint)
+
 # XRLint - A linter for datasets