Add Deployment documentation

docs/deployment-guide.md

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