Add instructions on how to setup kubectl

docs/setup/independent/create-cluster-kubeadm.md

@@ -179,6 +179,13 @@ as root:
   kubeadm join --token <token> <master-ip>:<master-port> --discovery-token-ca-cert-hash sha256:<hash>
 ```
 
+To let kubectl work in the following steps, you need to run these commands as a regular user (which is part of the output above):
+```
+  mkdir -p $HOME/.kube
+  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
+  sudo chown $(id -u):$(id -g) $HOME/.kube/config
+```
+
 Make a record of the `kubeadm join` command that `kubeadm init` outputs. You
 will need this in a moment.