doc: readme badge

Author: bclavie

README.md

@@ -2,6 +2,7 @@
 # rerankers
 
 ![Python Versions](https://img.shields.io/badge/Python-3.8_3.9_3.10_3.11-blue)
+[![Downloads](https://static.pepy.tech/badge/rerankers/month)](https://pepy.tech/project/rerankers)
 [![Twitter Follow](https://img.shields.io/twitter/follow/bclavie?style=social)](https://twitter.com/bclavie)