add hint on how to install heketi-cli

contrib/network-storage/heketi/README.md

@@ -1,6 +1,9 @@
 # Deploy Heketi/Glusterfs into Kubespray/Kubernetes
 This playbook aims to automate [this](https://github.com/heketi/heketi/blob/master/docs/admin/install-kubernetes.md) tutorial. It deploys heketi/glusterfs into kubernetes and sets up a storageclass.
 
+## Client Setup
+Heketi provides a CLI that provides users with a means to administer the deployment and configuration of GlusterFS in Kubernetes. [Download and install the heketi-cli](https://github.com/heketi/heketi/releases) on your client machine.
+
 ## Install
 Copy the inventory.yml.sample over to inventory/sample/k8s_heketi_inventory.yml and change it according to your setup.
 ```