CWG-57: Add coverage in pipeline and badges to readmes

{{cookiecutter.project_slug}}/README.md

 # {{cookiecutter.project_name}}
 
+<!-- TODO: replace  -->
+![Build status](https://git.astron.nl/templates/python-package/badges/main/pipeline.svg)
+![Test coverage](https://git.astron.nl/templates/python-package/badges/main/coverage.svg)
+<!-- ![Latest release](https://git.astron.nl/templates/python-package/badges/main/release.svg) -->
+
 An example repository of an CI/CD pipeline for building, testing and publishing a python package.
 
 ## Installation