docs(readme): add Docker badges (pulls and stars) (#55)

Author: Djaytan

README.md

@@ -5,7 +5,9 @@
 ![Compatibility](https://img.shields.io/badge/PaperMC_Support-v1.21.4-blue)
 [![CI](https://github.com/Djaytan/docker-papermc-server/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/Djaytan/docker-papermc-server/actions/workflows/ci.yml)
 [![OpenSSF Best Practices](https://www.bestpractices.dev/projects/10360/badge)](https://www.bestpractices.dev/projects/10360)
-[![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/Djaytan/docker-papermc-server/badge)](https://securityscorecards.dev/viewer/?uri=github.com/Djaytan/docker-papermc-server)
+[![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/Djaytan/docker-papermc-server/badge)](https://securityscorecards.dev/viewer/?uri=github.com/Djaytan/docker-papermc-server)<br/>
+[![Docker Pulls](https://img.shields.io/docker/pulls/djaytan/papermc-server.svg?logo=docker)](https://hub.docker.com/r/djaytan/papermc-server/)
+[![Docker Stars](https://img.shields.io/docker/stars/djaytan/papermc-server.svg?logo=docker)](https://hub.docker.com/r/djaytan/papermc-server/)
 
 Dockerized and fine-grained customizable PaperMC server.