README badges

Author: peppelinux

README.md

@@ -2,7 +2,10 @@ djangosaml2
 ===========
 
 ![CI build](https://github.com/peppelinux/djangosaml2/workflows/djangosaml2/badge.svg)
+![pypi](https://img.shields.io/pypi/v/djangosaml2.svg)
 ![Python version](https://img.shields.io/badge/license-Apache%202-blue.svg)
+![Django versions](https://img.shields.io/pypi/djversions/djangosaml2)
+![Documentation Status](https://readthedocs.org/projects/djangosaml2/badge/?version=latest)
 ![License](https://img.shields.io/badge/python-3.7%20%7C%203.8%20%7C%203.9-blue.svg)