add usecases to USECASES doc

Author: sankarpn

integration-tests/USECASES.MD

@@ -148,3 +148,10 @@ Configuration Overrides Usecases
 | Pod Templates | Use Case |
 | --- | --- |
 | Using pod templates/variables | Use DOMAIN_UID, DOMAIN_NAME, DOMAIN_HOME, SERVER_NAME, LOG_HOME variables at domain level and CLUSTER_NAME at cluster level. Bring up the domain and make sure domain started successfully when pod templates are used |
+
+| Init Container | Use Case |
+| --- | --- |
+| Add initContainers to domain | Add a initContainers object to spec level and verify the init containers are created for weblogic server pods prior to starting it and runs to completion and then weblogic pod are started |
+| Add initContainers to adminServer | Add a initContainers object to adminServer level and verify the init container is created for administration server weblogic server pod prior to starting it and runs to completion and then weblogic pod is started |
+| Add initContainers to Clusters | Add a initContainers object to Clusters level and verify the init containers are created for weblogic server pods prior to starting the clusters and runs to completion and then weblogic pod are started |
+| Add initContainers to managedServers | Add a initContainers object to managed server level and verify the init container is created for managed server weblogic server pod prior to starting it and runs to completion and then weblogic pod is started |