doc/zh_CN: add Chinese translation prefer section

The add words is:

Tranlation plan:
Welcome for any part of kernel doc Chinese translation, expecially for
admin-guide part.

Signed-off-by: Alex Shi <[email protected]>
Cc: Harry Wei <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Corbet <[email protected]>

Author: alexshi

Documentation/translations/zh_CN/index.rst

@@ -10,6 +10,9 @@
 人员做出贡献。 与任何大型社区一样，知道如何完成任务将使得更改合并的过程变得更
 加容易。
 
+翻译计划:
+内核中文文档欢迎任何翻译投稿，特别是关于内核用户和管理员指南部分。
+
 .. toctree::
    :maxdepth: 2