docs(runner-controller): link runner controller repo in README [skip ci]

Author: Marius Boden

README.md

@@ -1,6 +1,9 @@
 # terraform-kubectl-github-actions-runner
+
 Setup the a GitHub Actions Runner in an existing kubernetes cluster
 
+To setup the runner controller see the [actions runner controller module](https://registry.terraform.io/modules/infinite-automations/github-actions-runner-controller/helm/latest) from the [terraform-kubectl-github-actions-runner-controller](https://github.com/infinite-automations/terraform-helm-github-actions-runner-controller) repository.
+
 <!-- BEGIN_TF_DOCS -->