update README: add Artifact Hub badge

Signed-off-by: Mehdi Nassim KHODJA <18899702+naskio@users.noreply.github.com>

README.md

@@ -1,10 +1,12 @@
 <div align="center">
-<img src="./logo.svg" width="200"/>
-
-<p><a href="https://circleci.com/gh/armadaproject/armada"><img src="https://circleci.com/gh/helm/helm.svg?style=shield" alt="CircleCI"></a>
-<a href="https://goreportcard.com/report/github.com/armadaproject/armada"><img src="https://goreportcard.com/badge/github.com/armadaproject/armada" alt="Go Report Card"></a>
-<a href="https://insights.lfx.linuxfoundation.org/foundation/cncf/overview?project=armada" title="Click to view project insights and health checks"><img src="https://img.shields.io/badge/LFX%20Insights-0094FF" alt="LFX Insights Dashboard"></a>
-</p></div>
+ <img src="./logo.svg" alt="Armada logo" width="200"/>
+ <p>
+  <a href="https://circleci.com/gh/armadaproject/armada"><img src="https://circleci.com/gh/helm/helm.svg?style=shield" alt="CircleCI"></a>
+  <a href="https://goreportcard.com/report/github.com/armadaproject/armada"><img src="https://goreportcard.com/badge/github.com/armadaproject/armada" alt="Go Report Card"></a>
+  <a href="https://artifacthub.io/packages/helm/gresearch/armada" title="Go to Artifact Hub"><img src="https://img.shields.io/endpoint?url=https://artifacthub.io/badge/repository/armada" alt="Artifact Hub"></a>        
+  <a href="https://insights.lfx.linuxfoundation.org/foundation/cncf/overview?project=armada" title="Click to view project insights and health checks"><img src="https://img.shields.io/badge/LFX%20Insights-0094FF" alt="LFX Insights Dashboard"></a>
+ </p>
+</div>
 
 # Armada