ceph: add cephfs examples yamls for restore,clone and snapshotclass

Signed-off-by: Humble Chirammal <hchiramm@redhat.com>

cluster/examples/kubernetes/ceph/csi/cephfs/pvc-clone.yaml

@@ -0,0 +1,15 @@
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: cephfs-pvc-clone
+spec:
+  storageClassName: rook-cephfs
+  dataSource:
+    name: cephfs-pvc
+    kind: PersistentVolumeClaim
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 1Gi

cluster/examples/kubernetes/ceph/csi/cephfs/pvc-restore.yaml

@@ -0,0 +1,16 @@
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: cephfs-pvc-restore
+spec:
+  storageClassName: rook-cephfs
+  dataSource:
+    name: cephfs-pvc-snapshot
+    kind: VolumeSnapshot
+    apiGroup: snapshot.storage.k8s.io
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 1Gi

cluster/examples/kubernetes/ceph/csi/cephfs/snapshot.yaml

@@ -0,0 +1,9 @@
+---
+apiVersion: snapshot.storage.k8s.io/v1beta1
+kind: VolumeSnapshot
+metadata:
+  name: cephfs-pvc-snapshot
+spec:
+  volumeSnapshotClassName: csi-cephfsplugin-snapclass
+  source:
+    persistentVolumeClaimName: cephfs-pvc

cluster/examples/kubernetes/ceph/csi/cephfs/snapshotclass.yaml

@@ -0,0 +1,14 @@
+---
+apiVersion: snapshot.storage.k8s.io/v1beta1
+kind: VolumeSnapshotClass
+metadata:
+  name: csi-cephfsplugin-snapclass
+driver: rook-ceph.cephfs.csi.ceph.com
+parameters:
+  # Specify a string that identifies your cluster. Ceph CSI supports any
+  # unique string. When Ceph CSI is deployed by Rook use the Rook namespace,
+  # for example "rook-ceph".
+  clusterID: rook-ceph
+  csi.storage.k8s.io/snapshotter-secret-name: rook-csi-cephfs-provisioner
+  csi.storage.k8s.io/snapshotter-secret-namespace: rook-ceph
+deletionPolicy: Delete