Initialize benchmark/ directory to hold all Keras benchmarks.

PiperOrigin-RevId: 313467179
Change-Id: I06f3505182f67eab4866e1cbfa6043588a6eecc1

tensorflow/python/keras/benchmark/README.md

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+# Keras Benchmark
+
+This package contains benchmarks on Keras models and components.

tensorflow/python/keras/benchmark/__init__.py

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+# Copyright 2020 The TensorFlow Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ==============================================================================
+"""Keras Benchmark."""
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function