Add example stateful sets

examples/kubernetes/statefulset/README.md

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+## Use in Stateful Set
+This example shows how to consume EFS filesystem from StatefulSets using the driver. Before the example, refer to [StatefulSets](https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/) for what it is.
+
+## Deploy the example
+
+```sh
+kubectl apply -f https://raw.githubusercontent.com/kubernetes-sigs/aws-efs-csi-driver/master/examples/kubernetes/statefulset/specs/example.yaml
+```
+
+## Check the StatefulSets Application
+Check StatefulSets is deployed successfully:
+```sh
+$ kubectl get sts
+NAME          READY   AGE
+efs-app-sts   3/3     70m
+``` 
+
+Check the pods are running:
+```sh
+$ kubectl get po
+NAME            READY   STATUS    RESTARTS   AGE
+efs-app-sts-0   1/1     Running   0          71m
+efs-app-sts-1   1/1     Running   0          71m
+efs-app-sts-2   1/1     Running   0          71m
+```
+
+Check data are written onto EFS filesystem:
+```sh
+$ kubectl exec -ti efs-app-sts-0 -- tail -f /efs-data/out.txt
+Mon May 6 00:50:15 UTC 2019
+Mon May 6 00:50:18 UTC 2019
+Mon May 6 00:50:19 UTC 2019
+Mon May 6 00:50:20 UTC 2019
+Mon May 6 00:50:23 UTC 2019
+Mon May 6 00:50:24 UTC 2019
+Mon May 6 00:50:25 UTC 2019
+Mon May 6 00:50:28 UTC 2019
+Mon May 6 00:50:29 UTC 2019
+Mon May 6 00:50:30 UTC 2019
+```
+

examples/kubernetes/statefulset/specs/example.yaml

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+apiVersion: v1
+kind: PersistentVolume
+metadata:
+  name: efs-pv
+spec:
+  capacity:
+    storage: 5Gi
+  volumeMode: Filesystem
+  accessModes:
+    - ReadWriteMany
+  persistentVolumeReclaimPolicy: Retain
+  storageClassName: efs-sc
+  csi:
+    driver: efs.csi.aws.com
+    volumeHandle: fs-4af69aab
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: efs-claim
+spec:
+  accessModes:
+    - ReadWriteMany
+  storageClassName: efs-sc
+  resources:
+    requests:
+      storage: 5Gi
+---
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: efs-app-sts
+spec:
+  selector:
+    matchLabels:
+      app: test-efs
+  serviceName: efs-app
+  replicas: 3
+  template:
+    metadata:
+      labels:
+        app: test-efs
+    spec:
+      terminationGracePeriodSeconds: 10
+      containers:
+      - name: linux
+        image: amazonlinux:2 
+        command: ["/bin/sh"]
+        args: ["-c", "while true; do echo $(date -u) >> /efs-data/out.txt; sleep 5; done"]
+        volumeMounts:
+        - name: efs-storage
+          mountPath: /efs-data
+      volumes:
+      - name: efs-storage
+        persistentVolumeClaim:
+          claimName: efs-claim