Collect organisation type

So that we can default services to their appropriate text allowance, we
need to find out what sector they're in. So let's start collecting that
from teams as they create new services.

I think Central/Local/NHS are the right options, but these can be easily
changed if not.

app/notify_client/service_api_client.py

@@ -16,12 +16,21 @@ class ServiceAPIClient(NotifyAdminAPIClient):
         self.service_id = application.config['ADMIN_CLIENT_USER_NAME']
         self.api_key = application.config['ADMIN_CLIENT_SECRET']
 
-    def create_service(self, service_name, message_limit, restricted, user_id, email_from):
+    def create_service(
+        self,
+        service_name,
+        organisation_type,
+        message_limit,
+        restricted,
+        user_id,
+        email_from,
+    ):
         """
         Create a service and return the json.
         """
         data = {
             "name": service_name,
+            "organisation_type": organisation_type,
             "active": True,
             "message_limit": message_limit,
             "user_id": user_id,