Added getting started video

Author: mellson

docs/stately-sky-getting-started.mdx

@@ -13,6 +13,10 @@ This guide will walk you through the process of creating a simple traffic light
 2. Our Stately Sky starter project. [Clone the repo to your local machine](https://github.com/statelyai/sky-starter-app)
 3. A machine to deploy as an actor. To test, feel free to fork our [stop light example](https://stately.ai/registry/editor/eb3e89f5-5936-439f-8254-2f6ea4303659?machineId=15fd8071-b80c-4a6f-b9f5-60b6cf578ee5)
 
+## Getting started video
+
+<YouTube id="A_J1jbz1oWw" />
+
 ## Step 1: Create a machine in the Studio
 
 Create a project and compose your machine in the Studio with the transitions and states you want. For this example, we'll create a simple traffic light machine with three states: `green`, `yellow`, and `red`.