example curl for message start event

spiffworkflow-backend/src/spiffworkflow_backend/routes/messages_controller.py

@@ -59,6 +59,12 @@ def message_instance_list(
 #   payload: dict,
 #   process_instance_id: Optional[int],
 # }
+#
+# For example:
+# curl 'http://localhost:7000/v1.0/messages/gogo' \
+#  -H 'authorization: Bearer [FIXME]' \
+#  -H 'content-type: application/json' \
+#  --data-raw '{"payload":{"sure": "yes", "food": "spicy"}}'
 def message_send(
     message_name: str,
     body: Dict[str, Any],