OSDOCS-4591: Adding to install the resources as next steps

Author: bergerhoffer

modules/oc-mirror-oci-format.adoc

@@ -128,3 +128,7 @@ $ oc mirror --config=./imageset-config.yaml \ <1>
 ====
 You can optionally use the `--oci-insecure-signature-policy` flag to not push signatures to the target mirror registry.
 ====
+
+.Next steps
+
+* Install the `ImageContentSourcePolicy` and `CatalogSource` resources into the cluster.