add pypi version badge

README.md

@@ -1,8 +1,9 @@
 # jaxparrow
 
-![Python version](https://img.shields.io/badge/dynamic/yaml?url=https://raw.githubusercontent.com/meom-group/jaxparrow/master/.github/workflows/python-package.yml&label=Python&query=$.jobs.build.strategy.matrix["python-version"])
+![Python](https://img.shields.io/badge/dynamic/yaml?url=https://raw.githubusercontent.com/meom-group/jaxparrow/master/.github/workflows/python-package.yml&label=Python&query=$.jobs.build.strategy.matrix["python-version"])
+[![PyPi](https://img.shields.io/badge/dynamic/xml?url=https://pypi.org/rss/project/jaxparrow/releases.xml&label=PyPi&query=/rss/channel/item[1]/title)](https://pypi.org/project/jaxparrow/)
 ![Tests](https://github.com/meom-group/jaxparrow/actions/workflows/python-package.yml/badge.svg)
-![Docs](https://github.com/meom-group/jaxparrow/actions/workflows/python-documentation.yml/badge.svg)
+[![Docs](https://github.com/meom-group/jaxparrow/actions/workflows/python-documentation.yml/badge.svg)](https://meom-group.github.io/jaxparrow/)
 
 ***jaxparrow*** implements a novel approach based on a variational formulation to compute the inversion of the cyclogeostrophic balance.