wg-serving: add DRA workstream

Signed-off-by: Yuan Tang <[email protected]>

Author: terrytangyuan

wg-serving/README.md

@@ -49,6 +49,7 @@ The WG Serving will operate in several workstreams with different areas of focus
 - [Autoscaling](https://docs.google.com/document/d/1QsN4ubjerEqo5L4bQamOFFS2lmCv5zNPis2Z8gcIITg/edit?usp=sharing)
 - [MultiHost/MultiNode](https://docs.google.com/document/d/11-sK4ZIb-mJ7LGzIGx8eNViQUvZTFc5Ne4208LFEOwU/edit)
 - [Orchestration](https://docs.google.com/document/d/1hbEx3ZEqdXCqWH9RL3uy9FIy35B8pFJ5KiK3HsOz2FE/edit?usp=sharing)
+- [DRA](https://github.com/kubernetes/community/tree/master/wg-device-management)
 
 
 ## How to ...