add youtube link to readme

Author: SjorsO

README.md

@@ -10,7 +10,13 @@ Watchtower will send you an alert:
 No AI or enterprise complexity, just an alert when things go wrong.
 
 ## Learn more
-Visit https://watchtower.dev/about to learn more about Watchtower. 
+Visit https://watchtower.dev/about to learn more about Watchtower or watch a YouTube video:
+
+<a href="https://www.youtube.com/watch?v=v5G82b0nkBs">
+  <img src="https://watchtower.dev/images/youtube-thumbnail.jpg"
+       alt="Learn more about Watchtower on YouTube"
+      width="320"/>
+</a>
 
 ## Explore the code
 Here are good places to start if you'd like to explore the code: