add deepspeed example

examples/v2beta1/deepspeed/README.MD

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+# DeeepSpeed Example
+
+This demo introduces the basic usage of deepspeed with mpi-operator.
+
+## References
+
+* https://github.com/microsoft/DeepSpeedExamples/blob/master/training/HelloDeepSpeed/README.md
+* https://www.alibabacloud.com/help/en/ack/cloud-native-ai-suite/user-guide/deepspeed-distributed-training

examples/v2beta1/deepspeed/deepspeed-helloworld.yaml

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+apiVersion: kubeflow.org/v2beta1
+kind: MPIJob
+metadata:
+  name: deepspeed-helloworld
+spec:
+  slotsPerWorker: 1
+  runPolicy:
+    cleanPodPolicy: Running
+  mpiReplicaSpecs:
+    Launcher:
+      replicas: 1
+      template:
+        spec:
+          containers:
+          - image: registry.cn-beijing.aliyuncs.com/acs/deepspeed:hello-deepspeed
+            name: deepspeed-helloworld
+            command:
+            - deepspeed
+            args:
+            - /workspace/DeepSpeedExamples/HelloDeepSpeed/train_bert_ds.py
+            - --checkpoint_dir
+            - /workspace
+    Worker:
+      replicas: 2
+      template:
+        spec:
+          containers:
+           - image: registry.cn-beijing.aliyuncs.com/acs/deepspeed:hello-deepspeed
+            name: deepspeed-helloworld
+            resources:
+              limits:
+                nvidia.com/gpu: 8