Add pypi version

Author: b-yogesh

chartlets.py/README.md

@@ -1,6 +1,7 @@
 # chartlets 
 
 [![Backend CI workflow](https://github.com/bcdev/chartlets/actions/workflows/backend-ci.yml/badge.svg)](https://github.com/bcdev/chartlets/actions/workflows/backend-ci.yml)
+[![PyPI Version](https://img.shields.io/pypi/v/chartlets)](https://pypi.org/project/chartlets/)
 
 Chartlets is a software framework that allows websites developed with
 React to be extended by server-side widgets programmed in Python or other