Update README.md with "maintained by Plotly" badge

README.md

@@ -5,7 +5,14 @@
 [![Codacy Badge](https://app.codacy.com/project/badge/Grade/bb3adb454b424e66ae3b9bdf2ab2fce1)](https://www.codacy.com/gh/goharbor/harbor-operator/dashboard?utm_source=github.com&utm_medium=referral&utm_content=goharbor/harbor-operator&utm_campaign=Badge_Grade)
 [![Go Reference](https://pkg.go.dev/badge/github.com/goharbor/harbor-operator.svg)](https://pkg.go.dev/github.com/goharbor/harbor-operator)
 
-> **ATTENTIONS:** THE `main` BRANCH MAY BE IN AN UNSTABLE OR EVEN BROKEN STATE DURING DEVELOPMENT.
+<div align="center">
+  <a href="https://dash.plotly.com/project-maintenance">
+    <img src="https://dash.plotly.com/assets/images/maintained-by-plotly.png" width="400px" alt="Maintained by Plotly">
+  </a>
+</div>
+
+
+> **ATTENTION:** THE `main` BRANCH MAY BE IN AN UNSTABLE OR EVEN BROKEN STATE DURING DEVELOPMENT.
 
 [Harbor](https://github.com/goharbor/harbor/) is a CNCF hosted open source trusted cloud-native registry project that stores, signs, and scans content. Harbor is composed on numerous stateful and stateless components and dependencies that may be deployed, updated, healed, backuped or scaled respecting some constraints.