add video to demo's README.md

demo/README.md

@@ -98,3 +98,11 @@ Submit a PR where you make a change to the overrides and you'll see the [Github
 <img width="1099" alt="1" src="https://github.com/1debit/mani-diffy/assets/9005904/6b6d9e45-57f7-43ff-906f-ebf4c0a03ad9">
 <img width="1701" alt="2" src="https://github.com/1debit/mani-diffy/assets/9005904/03d4a49e-1fc9-40a1-9882-1c032b2d345b">
 
+# See it in action in a video !
+
+In this screen recording a pull request is opened to:
+
+1. Bump the count of pods for the `foo` service in the prod cluster
+2. Add an annotation to all services
+
+https://github.com/1debit/mani-diffy/assets/9005904/6c496996-f7af-4932-bf5d-01a5b57bbd99