Create __init__.py in example folder (#3093)

Summary:
For my internal CentOS development env, `python -m examples/models/...` does not work with error message that module cannot be found. Adding this empty file fixes the issue.

Pull Request resolved: #3093

Reviewed By: cccclai

Differential Revision: D56242802

Pulled By: iseeyuan

fbshipit-source-id: 33b98855682490ed1242b1cd2843e7963831915a

Author: iseeyuan

examples/__init__.py

@@ -0,0 +1,5 @@
+# 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.