chore: Added Artifact Hub badge to readme

Signed-off-by: Eddie Knight <[email protected]>

README.md

@@ -1,4 +1,8 @@
-[![slack](https://img.shields.io/badge/slack-argoproj-brightgreen.svg?logo=slack)](https://argoproj.github.io/community/join-slack) [![CI](https://github.com/argoproj/argo-workflows/workflows/CI/badge.svg)](https://github.com/argoproj/argo-workflows/actions?query=event%3Apush+branch%3Amaster) [![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/3830/badge)](https://bestpractices.coreinfrastructure.org/projects/3830) [![Twitter Follow](https://img.shields.io/twitter/follow/argoproj?style=social)](https://twitter.com/argoproj)
+[![slack](https://img.shields.io/badge/slack-argoproj-brightgreen.svg?logo=slack)](https://argoproj.github.io/community/join-slack)
+[![CI](https://github.com/argoproj/argo-workflows/workflows/CI/badge.svg)](https://github.com/argoproj/argo-workflows/actions?query=event%3Apush+branch%3Amaster)
+[![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/3830/badge)](https://bestpractices.coreinfrastructure.org/projects/3830)
+[![Artifact HUB](https://img.shields.io/endpoint?url=https://artifacthub.io/badge/repository/argo-workflows)](https://artifacthub.io/packages/helm/argo/argo-workflows)
+[![Twitter Follow](https://img.shields.io/twitter/follow/argoproj?style=social)](https://twitter.com/argoproj)
 
 ## What is Argo Workflows?