Adding remote api sample

Change-Id: I73effffef6fafa576fd8187edefb0dd1ce1fb9d5

appengine/remote_api/app.yaml

@@ -0,0 +1,6 @@
+runtime: python27
+api_version: 1
+threadsafe: true
+
+builtins:
+- remote_api: on

appengine/remote_api/client.py

@@ -0,0 +1,53 @@
+# 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.
+
+"""Sample app that uses the Google App Engine Remote API to make calls to the
+live App Engine APIs."""
+
+# [START all]
+
+import argparse
+
+try:
+    import dev_appserver
+    dev_appserver.fix_sys_path()
+except ImportError:
+    print('Please make sure the App Engine SDK is in your PYTHONPATH.')
+
+from google.appengine.ext import ndb
+from google.appengine.ext.remote_api import remote_api_stub
+
+
+def main(project_id):
+    remote_api_stub.ConfigureRemoteApiForOAuth(
+        '{}.appspot.com'.format(project_id),
+        '/_ah/remote_api')
+
+    # List the first 10 keys in the datastore.
+    keys = ndb.Query().fetch(10, keys_only=True)
+
+    for key in keys:
+        print(key)
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(
+        description=__doc__,
+        formatter_class=argparse.RawDescriptionHelpFormatter)
+    parser.add_argument('project_id', help='Your Project ID.')
+
+    args = parser.parse_args()
+
+    main(args.project_id)
+# [END all]