Add lead-in to table of UWP links

Author: alvinashcraft

hub/apps/develop/files/index.md

@@ -33,6 +33,8 @@ For examples of using the .NET APIs in a WinUI app, see [Access files and folder
 
 ## Additional resources for working with files and folders
 
+If you're developing packaged WinUI apps, the WinRT storage APIs can be a powerful tool for reading and writing data. The following UWP topics provide a wealth of information for developers looking to leverage these APIs in their apps.
+
 | Topic | Description |
 |-------|-------------|
 | [Enumerate and query files and folders](/windows/uwp/files/quickstart-listing-files-and-folders) | Access files and folders in either a folder, library, device, or network   location. You can also query the files and folders in a location by constructing file and folder queries. |