docs: add "Working with Graphs and GraphQL" to the Media section of the README (#4846)

Author: danstarns

README.md

@@ -71,6 +71,7 @@ GraphQL content.
 * [Migrating To The Official Neo4j GraphQL Library](https://youtu.be/4_rp1ikvFKc)
 * [Announcing the Stable Release of the Official Neo4j GraphQL Library 1.0.0](https://medium.com/neo4j/announcing-the-stable-release-of-the-official-neo4j-graphql-library-1-0-0-6cdd30cd40b)
 * [Announcing the Neo4j GraphQL Library Beta Release](https://medium.com/neo4j/announcing-the-neo4j-graphql-library-beta-99ae8541bbe7)
+* [Working with Graphs and GraphQL](https://youtu.be/qXQDG2GAs5w)
 
 ## Learn with GraphAcademy