Chinese translation for Build/installation instructions.

[brianh-osu]

Hi there!

This is related to issue: https://github.com/openstreetmap/iD/issues/10249

The language is translated to Chinese, and would have to be maintained by contributors. I've added the "Updated date" at the bottom of the document so that the reader is aware that the document can be updated occasionally.

The document in concern is: https://github.com/openstreetmap/iD/wiki/Build-Instructions-(Chinese) ; I'm not certain if a pull request needs to be created for this type of request (as it is for a wiki upload instead of actual code repo).

Thank you in advance.