Update README.md

onto something... 

reading https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/storing-workflow-data-as-artifacts

README.md

@@ -3,6 +3,7 @@
 [![Anaconda-Server Badge](https://anaconda.org/noaa-gfdl/fre-cli/badges/latest_release_date.svg)](https://anaconda.org/noaa-gfdl/fre-cli)
 [![Anaconda-Server Badge](https://anaconda.org/noaa-gfdl/fre-cli/badges/latest_release_relative_date.svg)](https://anaconda.org/noaa-gfdl/fre-cli)
 [![CI](https://github.com/NOAA-GFDL/fre-cli/workflows/publish_conda/badge.svg)](https://github.com/NOAA-GFDL/fre-cli/actions?query=workflow%3Apublish_conda+branch%3Amain++)
+[![Coverage Status](https://github.com/NOAA-GFDL/fre-cli/workflows/create_test_conda_env/cov_badge.svg)](https://github.com/NOAA-GFDL/fre-cli/actions?query=workflow%3Acreate_test_conda_env+branch%3Amain++)
 
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