docs/zh_CN: Add rust coding-guidelines Chinese translation

Translate .../rust/coding-guidelines.rst into Chinese.

Signed-off-by: Yanteng Si <siyanteng@loongson.cn>
Reviewed-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Alex Shi <alexs@kernel.org>
Reviewed-by: Wu XiangCheng <bobwxc@email.cn>
Link: https://lore.kernel.org/r/ec8cb81c59a399dd9eced437cb196f4481c562e7.1666959529.git.siyanteng@loongson.cn


Signed-off-by: Jonathan Corbet <corbet@lwn.net>