add notice that this is a community project

Signed-off-by: Simon L. <[email protected]>

Author: szaimen

README.md

@@ -2,6 +2,8 @@
 
 [Helm](https://helm.sh) repo for different charts related to Nextcloud which can be installed on [Kubernetes](https://kubernetes.io)
 
+⚠️⚠️⚠️ This project is maintained by community volunteers and designed for expert use. For quick and easy deployment that supports the full set of Nextcloud Hub features, use the [Nextcloud All-in-One project](https://github.com/nextcloud/all-in-one#nextcloud-all-in-one) maintained by Nextcloud GmbH.
+
 ### Add Helm repository
 
 To install the repo just run: