[nodebb-plugin-chinese-slugify] Translate slug from Chinese characters to Pinyin

[Yang Zhang 0]

I have written a plugin to translate from Chinese characters to Pinyin so that in the url there will be only English letters which are search friendly.

An example can be found here:

https://www.sydneybb.com/topic/26/shiyongnginxjianghttpdiaozhuandaohttps