add pypi badge

Author: ElectricalBoy

README.md

@@ -1,6 +1,7 @@
 # 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)
+![PyPI - Version](https://img.shields.io/pypi/v/lpdb_python)
 [![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)