Add deployment documentation

docs/deployment-guide.md

@@ -0,0 +1,21 @@
+# Deploying Container Object Storage Interface (COSI) Controller On Kubernetes
+
+This document describes steps for Kubernetes administrators to setup Container Object Storage Interface Controller (COSI) Controller onto a Kubernetes cluster.
+
+COSI controller can be setup using the [kustomization file](https://github.com/kubernetes-sigs/container-object-storage-interface-controller/blob/master/kustomization.yaml) from the [container-object-storage-interface-controller](https://github.com/kubernetes-sigs/container-object-storage-interface-controller) repository with following command:
+
+```sh
+kubectl create -k github.com/kubernetes-sigs/container-object-storage-interface-controller
+```
+The output should look like the following:
+```sh
+serviceaccount/objectstorage-controller-sa created
+role.rbac.authorization.k8s.io/objectstorage-controller created
+clusterrole.rbac.authorization.k8s.io/objectstorage-controller-role created
+rolebinding.rbac.authorization.k8s.io/objectstorage-controller created
+clusterrolebinding.rbac.authorization.k8s.io/objectstorage-controller created
+deployment.apps/objectstorage-controller created
+```
+
+The controller will be deployed in the `default` namespace.
+