Added link to part 9

Author: abelperezok

README.md

@@ -28,4 +28,5 @@ The final result should look like this:
 - [Part 5 - Bootstrapping the Control Plane](05-Control-Plane.md)
 - [Part 6 - Bootstrapping the Worker Nodes](06-Worker-Nodes.md)
 - [Part 7 - Configuring for Remote Access](07-Remote-Access.md)
-- [Part 8 - Provisioning Pod Network Routes](08-Network-Routes.md)
+- [Part 8 - Provisioning Pod Network Routes](08-Network-Routes.md)
+- [Part 9 - Deploying the DNS Cluster Add-on](09-Core-DNS.md)