Add Chinese courses about CentOS and Linux (#11078)

* Add Chinese courses about CentOS and Linux

Signed-off-by: xiaobo <xiaobo@uniontech.com>

* Update free-courses-zh.md

---------

Signed-off-by: xiaobo <xiaobo@uniontech.com>

courses/free-courses-zh.md

@@ -19,6 +19,7 @@
 ### Linux
 
 * [Linux 核心設計](https://youtube.com/playlist?list=PL6S9AqLQkFpongEA75M15_BlQBC9rTdd8) - jserv
+* [Linux 教程 CentOS 从入门到精通](https://www.youtube.com/playlist?list=PL9nxfq1tlKKlImsI9_iDguCUOhLFGamKI) - Jomy King
 
 
 ### OS