Merge pull request #873 from xieydd/master

Add Unisound to who-is-using doc

Author: k8s-ci-robot

doc/usage/who-is-using.md

@@ -7,3 +7,4 @@
 | [FfDL](https://github.com/IBM/FfDL)| [@animeshsingh](https://github.com/animeshsingh)| |  |
 | [MOGU Inc](https://www.mogujie.com)| [@jiaxuanzhou](https://github.com/jiaxuanzhou)| Production |  The scheduler for Tiny+  offline training|
 | [Vivo](https://www.vivo.com)| [@zionwu](https://github.com/zionwu)| Production |  The scheduler for Vtraining offline training|
+| [Unisound](https://www.unisound.com)| [@xieydd](https://github.com/xieydd)| Production | The scheduler for Uniflow offline training in ATLAS AI Plateform|