Google Cloud Storage connector docs: video how-to embed link (#328)

Author: Paul-Cornell

snippets/general-shared-text/gcs.mdx

@@ -1,5 +1,15 @@
 The Google Cloud Storage prerequisites:
 
+<iframe
+width="560"
+height="315"
+src="https://www.youtube.com/embed/HYaALQ0F-L4"
+title="YouTube video player"
+frameborder="0"
+allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"
+allowfullscreen
+></iframe>
+
 - A Google Cloud service account. [Create a service account](https://cloud.google.com/iam/docs/service-accounts-create#console).
 - A service account key for the service account. See [Create a service account key](https://cloud.google.com/iam/docs/keys-create-delete#creating) in
   [Create and delete service account keys](https://cloud.google.com/iam/docs/keys-create-delete).