Add link to video with examples of how to migrate away

Add a link to the EmberFest talk that describes the rationale behind these modifiers and concrete examples on how what the modern alternatives are.

Author: achambers

README.md

@@ -23,6 +23,13 @@ quickly bridging the gap between classic components and Glimmer components, but
 are still generally an anti-pattern. We recommend considering a custom modifier in
 most use-cases where you might want to reach for this package.
 
+_**For more information on why these modifiers exist and concrete examples of what the modern alternatives to using them are,
+watch the below talk from EmberFest 2022.**_
+
+<a href="https://www.youtube.com/watch?v=zwewg2xmpU8">
+  <img src="https://user-images.githubusercontent.com/416724/195643386-e4076f35-56f6-4244-aae0-0a02f936f952.png">
+</a>
+
 ## Compatibility
 
 - Ember.js v3.20 or above