Add KMS quickstart

kms/api/README.rst.in

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+# This file is used to generate README.rst
+
+product:
+  name: Google Cloud KMS API
+  short_name: Cloud KMS API
+  url: https://cloud.google.com/kms/docs/
+  description: >
+    The `Google Cloud KMS API`_ is a service that allows you to keep encryption
+    keys centrally in the cloud, for direct use by cloud services.
+
+setup:
+- auth
+- install_deps
+
+samples:
+- name: Quickstart
+  file: quickstart.py

kms/api/quickstart.py

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+#!/usr/bin/env python
+
+# Copyright 2017 Google, Inc
+#
+# 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
+
+
+def run_quickstart():
+    # [START kms_quickstart]
+    # Imports the Google APIs client library
+    from googleapiclient import discovery
+
+    # Your Google Cloud Platform project ID
+    project_id = 'YOUR_PROJECT_ID'
+
+    # The "global" zone lists all keys. It can be a specific zone if desired.
+    zone = 'global'
+
+    # Instantiates a client
+    kms_client = discovery.build('cloudkms', 'v1beta1')
+
+    # The resource name of the location associated with the KeyRings
+    parent = 'projects/{}/locations/{}'.format(project_id, zone)
+
+    # Lists key rings
+    request = kms_client.projects().locations().keyRings().list(parent=parent)
+    response = request.execute()
+
+    if 'key_rings' in response and len(response['key_rings']):
+        print('Key rings:')
+        for key_ring in response['key_rings']:
+            print(key_ring['name'])
+    else:
+        print('No key rings found.')
+    # [END kms_quickstart]
+
+
+if __name__ == '__main__':
+    run_quickstart()

kms/api/requirements.txt

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+google-api-python-client==1.6.0