Add contributor metadata (MicrosoftDocs#1073)

Author: Mike Wasson

docs/reference-architectures/ai/realtime-scoring-r.md

@@ -3,6 +3,7 @@ title: Real-time scoring of R machine learning models
 description:  Implement a real-time prediction service in R using Machine Learning Server running in Azure Kubernetes Service (AKS).
 author: njray
 ms.date: 12/12/18
+ms.custom: azcat-ai
 ---
 
 # Real-time scoring of R machine learning models
@@ -88,4 +89,4 @@ The reference implementation of this architecture is available on [GitHub][githu
 [plumber]: https://www.rplumber.io
 [RBAC]: /azure/role-based-access-control/overview
 [storage]: /azure/storage/common/storage-introduction
-[0]: ./_images/realtime-scoring-r.png
+[0]: ./_images/realtime-scoring-r.png