Update README with Visual HTML Skills link

Added link to Visual HTML Skills in README.

Author: backnotprop

README.md

@@ -32,7 +32,7 @@
 </p>
 
 <p align="center">
-  <a href="https://www.youtube.com/watch?v=a_AT7cEN_9I">Watch the og demo</a> · <a href="https://plannotator.ai/docs/getting-started/installation/">Installation guide</a> · <a href="https://plannotator.ai/">Official site</a>
+  <a href="https://www.youtube.com/watch?v=a_AT7cEN_9I">Watch the og demo</a> · <a href="https://plannotator.ai/docs/getting-started/installation/">Installation guide</a> · <a href="https://plannotator.ai/">Official site</a> · <a href="https://github.com/plannotator/effective-html">Visual HTML Skills</a>
 </p>
 
 # Plannotator