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

Author: jmdobry

samples/snippets/cloud-client/quickstart.py

@@ -0,0 +1,39 @@
+#!/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 language_quickstart]
+    # Imports the Google Cloud client library
+    from google.cloud import language
+
+    # Instantiates a client
+    language_client = language.Client()
+
+    # The text to analyze
+    text = 'Hello, world!'
+    document = language_client.document_from_text(text)
+
+    # Detects the sentiment of the text
+    sentiment = document.analyze_sentiment()
+
+    print('Text: {}'.format(text))
+    print('Sentiment: {}, {}'.format(sentiment.polarity, sentiment.magnitude))
+    # [END language_quickstart]
+
+
+if __name__ == '__main__':
+    run_quickstart()

samples/snippets/cloud-client/requirements.txt

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+google-cloud-language==0.20.0