Merge branch 'feature10997-OCI_registries' into 'master'

Update 06-osm-platform-configuration.md

See merge request !148

06-osm-platform-configuration.md

@@ -621,7 +621,7 @@ In order to add a repo, the user should invoke the following command:
 osm repo-add <name> <URI> type:<chart|bundle>
 ```
 
-Where the type of repo should be either `chart` for applications based on Helm Charts, or `bundle` for applications based in Juju bundles for K8s.
+Where the type of repo should be either `chart` for applications based on Helm Charts, or `bundle` for applications based in Juju bundles for K8s. If the repo is a helm OCI registry, add the flag `--oci` and provide credentials using `--user` and `--password`.
 
 This call will trigger the following actions in OSM: