Merge pull request #7069 from network-charles/network-charles-patch-2

kwok CAS: update README docs to include helm repo add

cluster-autoscaler/cloudprovider/kwok/README.md

@@ -26,6 +26,7 @@ Follow [the official docs to install `kwok`](https://kwok.sigs.k8s.io/docs/user/
 
 *Using helm chart*:
 ```shell
+helm repo add cluster-autoscaler https://kubernetes.github.io/autoscaler
 helm upgrade --install <release-name> charts/cluster-autoscaler  \
 --set "serviceMonitor.enabled"=true --set "serviceMonitor.namespace"=default \
 --set "cloudprovider"=kwok --set "image.tag"="<image-tag>" \