Feature: Add torchserve custom server with pv storage

docs/samples/custom/torchserve/custom-server-with-external-storage.md

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+# Torchserve with external storage
+
+For running torchserve with external storage, the model archive files and config.properties should be copied to the storage.
+
+The storage mount to ```/mnt/models``` directory.
+
+## Folder structure
+
+```
+├──config.properties
+├── model-store
+│   ├── mnist.mar
+|   ├── densenet161.mar
+```
+
+The entrypoint should be modified, to start torchserve with config.properties in ```/mnt/models``` path.
+
+## Create the InferenceService
+
+In the `torchserve-custom-pv.yaml` file edit the container image with your Docker image and add your pv storage.
+
+Apply the CRD
+
+```
+kubectl apply -f torchserve-custom.yaml
+```
+
+Expected Output
+
+```
+$ inferenceservice.serving.kubeflow.org/torchserve-custom created
+```

docs/samples/custom/torchserve/torchserve-custom-pv.yaml

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+apiVersion: "serving.kubeflow.org/v1beta1"
+kind: "InferenceService"
+metadata:
+  name: "torchserve-custom-pv"
+spec:
+  predictor:
+    containers:
+      - image: {username}/torchserve:latest
+        name: kfserving-container
+        ports:
+          - containerPort: 8080
+        env:
+          - name: STORAGE_URI
+            value: "pvc://model-pv-claim" # The storage mounts to /mnt/models