clearly state project maturity

README.md

@@ -16,6 +16,8 @@ K8up is a Kubernetes backup operator based on [Restic](https://restic.readthedoc
 Just create a `schedule` and a `credentials` object in the namespace you’d like to backup.
 It’s that easy. K8up takes care of the rest. It also provides a Prometheus endpoint for monitoring.
 
+K8up is production ready. It is used in production deployments since 2019.
+
 ## Documentation
 
 The documentation is written in AsciiDoc and published with Antora to [k8up.io](https://k8up.io/).

docs/modules/ROOT/pages/index.adoc

@@ -15,9 +15,15 @@ K8up (pronounced `/keɪtæpp/` or simply "ketchup") is a Kubernetes Operator dis
 * Check the backup repository for its integrity.
 * Prune old backups from a repository.
 * Restore backups with the help of the k8up CLI tool.
+
+K8up is:
+
+* Stable and production ready since 2019.
 * Based on top of https://restic.readthedocs.io/en/latest/[Restic], it can store backups in any S3-compatible storage, such as Amazon S3 or https://github.com/minio/minio#readme[Minio].
+* Written in https://golang.org/[Go].
+* A https://www.cncf.io/sandbox-projects/[CNCF Sandbox] Open Source project, https://github.com/k8up-io/k8up[hosted at GitHub].
 
-K8up is written in https://golang.org/[Go] and is an Open Source project https://github.com/k8up-io/k8up[hosted at GitHub].
+https://landscape.cncf.io/?item=runtime\--cloud-native-storage\--k8up[image:https://img.shields.io/badge/CNCF%20Landscape-5699C6[CNCF LANDSCAPE]]
 
 TIP: The xref:tutorials/tutorial.adoc[tutorial] gives you a glimpse into K8up. Give it a try!