Add downloads badges to README.md (#2795)

* Update README.md

Add downloads badges to the README.md

* Update README.md

---------

Co-authored-by: Jo Stichbury <jo_stichbury@mckinsey.com>

README.md

@@ -9,6 +9,8 @@
 ![Develop Branch Build](https://img.shields.io/circleci/build/github/kedro-org/kedro/develop?label=develop)
 [![Documentation](https://readthedocs.org/projects/kedro/badge/?version=stable)](https://docs.kedro.org/)
 [![OpenSSF Best Practices](https://bestpractices.coreinfrastructure.org/projects/6711/badge)](https://bestpractices.coreinfrastructure.org/projects/6711)
+[![Monthly downloads](https://static.pepy.tech/badge/kedro/month)](https://pepy.tech/project/kedro)
+[![Total downloads](https://static.pepy.tech/badge/kedro)](https://pepy.tech/project/kedro)
 
 ## What is Kedro?