Update desktop-feature-api.mdx (#655)

added awesome video from Jared

Author: shell1

docs/getting-started/engineers/desktop-feature-api.mdx

@@ -7,7 +7,9 @@ slug: /desktop-feature-api
 import Tabs from "@theme/Tabs";
 import TabItem from "@theme/TabItem";
 
-This guide will help you use the Nimbus Feature API in Desktop Firefox to run experiments, set values remotely, and manage user preferences. If you are familiar with Normandy and are trying to migrate a feature, you may want to check out the [Migration Guide for Pref Experiments](/desktop-migration-guide).
+This guide will help you use the Nimbus Feature API in Desktop Firefox to run experiments, set values remotely, and manage user preferences. If you are new to using Nimbus, here's a **[video overview of how the code interacts to control your feature](https://mozilla.hosted.panopto.com/Panopto/Pages/Viewer.aspx?id=45529d6a-27d4-42c4-891c-b22d016cfdd3)**.  The video until 5 minutes 44 seconds focuses on getting started.  Starting at 5:58 it switches to considerations when controlling preferences.
+
+If you are familiar with Normandy and are trying to migrate a feature, you may want to check out the [Migration Guide for Pref Experiments](/desktop-migration-guide).
 
 ## About the Feature API