add badges

Author: ElectricalBoy

README.md

@@ -1,5 +1,9 @@
 # LPDB-python
 
+[![CI](https://github.com/ElectricalBoy/LPDB_python/actions/workflows/ci.yml/badge.svg)](https://github.com/ElectricalBoy/LPDB_python/actions/workflows/ci.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/ElectricalBoy/LPDB-python)
+
 LPDB-python provides Python interfaces for the [Liquipedia Database API](https://liquipedia.net/api) (LPDB API).
 
 ## LPDB Session