Add badges to the repo (#393)

* Add badges to the repo

This will ensure that we comply with the expectations in
https://releases.juju.is/?team=MLOps

* review: Add Metadata Writer charm badge

Signed-off-by: Kimonas Sotirchos <[email protected]>

---------

Signed-off-by: Kimonas Sotirchos <[email protected]>

README.md

@@ -1,5 +1,16 @@
 ## Kubeflow Pipelines Operators
 
+[![Charmhub API](https://charmhub.io/kfp-api/badge.svg)](https://charmhub.io/kfp-api)
+[![Charmhub UI](https://charmhub.io/kfp-ui/badge.svg)](https://charmhub.io/kfp-ui)
+[![Charmhub Persistence](https://charmhub.io/kfp-persistence/badge.svg)](https://charmhub.io/kfp-persistence)
+[![Charmhub Profiles](https://charmhub.io/kfp-profile-controller/badge.svg)](https://charmhub.io/profile-controller)
+[![Charmhub SchedWork](https://charmhub.io/kfp-schedwf/badge.svg)](https://charmhub.io/kfp-schedwf)
+[![Charmhub Viewer](https://charmhub.io/kfp-viewer/badge.svg)](https://charmhub.io/kfp-viewer)
+[![Charmhub Viz](https://charmhub.io/kfp-viz/badge.svg)](https://charmhub.io/kfp-viz)
+[![Charmhub Metadata Writer](https://charmhub.io/kfp-metadata-writer/badge.svg)](https://charmhub.io/kfp-metadata-writer)
+[![PR merge](https://github.com/canonical/kfp-operators/actions/workflows/on_push.yaml/badge.svg)](https://github.com/canonical/kfp-operators/actions/workflows/on_push.yaml)
+[![PR open](https://github.com/canonical/kfp-operators/actions/workflows/on_pull_request.yaml/badge.svg)](https://github.com/canonical/kfp-operators/actions/workflows/on_pull_request.yaml)
+
 ### Overview
 This bundle encompasses the Kubernetes Python operators for Kubeflow Pipelines (see
 [CharmHub](https://charmhub.io/?q=kubeflow-pipelines)).