Note for basketallplayer (#1113)

* note for basketballplayer

* Update 1.overview.md

docs-2.0/3.ngql-guide/1.nGQL-overview/1.overview.md

@@ -23,6 +23,10 @@ nGQL is a project in progress. New features and optimizations are done steadily.
 
 Users can download the example data [Basketballplayer](https://docs.nebula-graph.io/2.0/basketballplayer-2.X.ngql) in Nebula Graph. After downloading the example data, you can import it to Nebula Graph by using the `-f` option in [Nebula Graph Console](../../2.quick-start/3.connect-to-nebula-graph.md).
 
+!!! note
+
+    Ensure that you have executed the `ADD HOSTS` command to add the Storage service to your Nebula Graph cluster before importing the example data. For more information, see [Manage Storage hosts](../../4.deployment-and-installation/manage-storage-host.md).
+
 ## Placeholder identifiers and values
 
 Refer to the following standards in nGQL: