Add AWS EFS To storage-classes.md (#47928)

* Update storage-classes.md

* Update storage-classes.md

Author: imuneeeb

content/en/docs/concepts/storage/storage-classes.md

@@ -296,6 +296,27 @@ allowedTopologies:
     values:
     - us-east-2c
 ```
+### AWS EFS
+
+To configure AWS EFS storage, you can use the out-of-tree [AWS_EFS_CSI_DRIVER](https://github.com/kubernetes-sigs/aws-efs-csi-driver).
+
+```yaml
+kind: StorageClass
+apiVersion: storage.k8s.io/v1
+metadata:
+  name: efs-sc
+provisioner: efs.csi.aws.com
+parameters:
+  provisioningMode: efs-ap
+  fileSystemId: fs-92107410
+  directoryPerms: "700"
+```
+
+- `provisioningMode`: The type of volume to be provisioned by Amazon EFS. Currently, only access point based provisioning is supported (`efs-ap`).
+- `fileSystemId`: The file system under which the access point is created.
+- `directoryPerms`: The directory permissions of the root directory created by the access point.
+
+For more details, refer to the [AWS_EFS_CSI_Driver Dynamic Provisioning](https://github.com/kubernetes-sigs/aws-efs-csi-driver/blob/master/examples/kubernetes/dynamic_provisioning/README.md) documentation.
 
 ### NFS