Update README.md

Author: matentzn

README.md

@@ -2,6 +2,7 @@
 
 [![Build the ODK images and run the tests](https://github.com/INCATools/ontology-development-kit/actions/workflows/build-and-test.yml/badge.svg)](https://github.com/INCATools/ontology-development-kit/actions/workflows/build-and-test.yml)
 [![DOI](https://zenodo.org/badge/48047921.svg)](https://zenodo.org/badge/latestdoi/48047921)
+[![DOI](https://img.shields.io/docker/pulls/obolibrary/odkfull.svg)](https://hub.docker.com/r/obolibrary/odkfull)
 
 
 Initialize a Git repo for managing your ontology the OBO Library way!