DLRM examples to create prediction using TorchRec library. This shows basic example of how to use TorchRec library quickly locally. (#3043)

Summary:
Pull Request resolved: #3043

Adding end to end example of using TorchRec library with DLRM to create recommendation. You can use this example in local machine to run and test how TorchRec is used for simple use case.

Differential Revision: D75989524

Author: yupadhyay

examples/prediction/README.md

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+# Running torchrec with torchx using Ray scheduler on a Ray cluster
+
+Install torchrec:
+
+```
+pip install --pre torchrec -f https://download.pytorch.org/whl/torchrec/index.html
+```
+
+Run locally:
+
+```
+python3 predict_using_torchrec.py
+```

examples/prediction/__init__.py

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+#!/usr/bin/env python3
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree.
+
+# pyre-strict
+
+
+def main() -> None:
+    """DOC_STRING"""
+
+
+if __name__ == "__main__":
+    main()