Add new "quickstart" samples [(googleapis#547)](GoogleCloudPlatform/python-docs-samples#547)

Author: jmdobry

samples/snippets/quickstart.py

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+#!/usr/bin/env python
+
+# Copyright 2016 Google Inc. 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.
+
+
+def run_quickstart():
+    # [START vision_quickstart]
+    import io
+
+    # Imports the Google Cloud client library
+    from google.cloud import vision
+
+    # Instantiates a client
+    vision_client = vision.Client()
+
+    # The name of the image file to annotate
+    fileName = './resources/wakeupcat.jpg'
+
+    # Loads the image into memory
+    with io.open(fileName, 'rb') as image_file:
+        image = vision_client.image(content=image_file.read())
+
+    # Performs label detection on the image file
+    labels = image.detect_labels()
+
+    print('Labels:')
+    for label in labels:
+        print(label.description)
+    # [END vision_quickstart]
+
+
+if __name__ == '__main__':
+    run_quickstart()

samples/snippets/requirements.txt

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+google-cloud-vision==0.20.0