docs/zh_CN: add disclaimer file

This a disclaimer file which will be included in Chinese files
as header. To reduce the same common contents copy.

Part of contents quoted from Federico Vaga's file:
    Documentation/translations/it_IT/disclaimer-ita.rst.
Thanks a lot!

Signed-off-by: Alex Shi <[email protected]>
Cc: Harry Wei <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Li Zefan <[email protected]>
Cc: Shawn Guo <[email protected]>
Cc: Fengguang Wu <[email protected]>
Cc: Coly Li <[email protected]>
Cc: Federico Vaga <[email protected]>
Signed-off-by: Weiwei Jia <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>

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