add de-allocate cluster

Author: Theo van Kraay

articles/managed-instance-apache-cassandra/create-cluster-portal.md

@@ -176,6 +176,12 @@ The service allows update to Cassandra YAML configuration on a datacenter via th
    > - cdc_raw_directory
    > - saved_caches_directory 
 
+## De-allocate cluster
+
+1. For non-production environments, you can pause/de-allocate resources in the cluster in order to avoid being charged for them (you will continue to be charged for storage). First change cluster type to `NonProduction`, then `deallocate`.
+
+   :::image type="content" source="./media/create-cluster-portal/pause-cluster.png" alt-text="Screenshot of pausing a cluster." lightbox="./media/create-cluster-portal/pause-cluster.png" border="true":::
+
 ## Troubleshooting
 
 If you encounter an error when applying permissions to your Virtual Network using Azure CLI, such as *Cannot find user or service principal in graph database for 'e5007d2c-4b13-4a74-9b6a-605d99f03501'*, you can apply the same permission manually from the Azure portal. Learn how to do this [here](add-service-principal.md).