add notes for csi storage/cloning

csi-storage/README.md

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+Testing whether we can clone/copy existing PVCs
+
+## steps
+
+* kubectl apply -f pvc1.yaml

csi-storage/pvc1.yaml

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+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: pvc1
+
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 1Gi
+  storageClassName: rook-ceph-block-hdd

csi-storage/pvc2.yaml

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+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+    name: clone-of-pvc-1
+    namespace: myns
+spec:
+  accessModes:
+  - ReadWriteOnce
+  storageClassName: cloning
+  resources:
+    requests:
+      storage: 5Gi
+  dataSource:
+    kind: PersistentVolumeClaim
+    name: pvc1