add managed notebook service example

examples/service-notebook/README.md

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+# Running a shared notebook as a service
+
+This directory contains two examples of running a shared notebook server as a service,
+one as a 'managed' service, and one as an external service with supervisor.
+
+A single-user notebook server is run as a service,
+and uses groups to authenticate a collection of users with the Hub.
+
+These examples require jupyterhub >= 0.7.2.
+

examples/service-notebook/managed/jupyterhub_config.py

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+# our user list
+c.Authenticator.whitelist = [
+    'minrk',
+    'ellisonbg',
+    'willingc',
+]
+
+# ellisonbg and willingc have access to a shared server:
+
+c.JupyterHub.load_groups = {
+    'shared': [
+        'ellisonbg',
+        'willingc',
+    ]
+}
+
+hub_ip = '127.0.0.1'
+hub_api_port = 8081
+service_name = 'shared-notebook'
+group_name = 'shared'
+service_port = 9999
+
+# start the notebook server as a service
+c.JupyterHub.services = [
+    {
+        'name': service_name,
+        'url': 'http://127.0.0.1:{}'.format(service_port),
+        'command': [
+            'jupyterhub-singleuser',
+            '--cookie-name=jupyterhub-services',
+            '--port={}'.format(service_port),
+            '--group={}'.format(group_name),
+            '--base-url=/services/{}'.format(service_name),
+            '--hub-prefix=/hub/',
+            '--hub-api-url=http://{}:{}/hub/api'.format(hub_ip, hub_api_port),
+        ]
+    }
+]