Adding installation instructions in Chinese

[brianh-osu]

Hiya!

I can see how this project can benefit from a Chinese version for the README and or installation instructions. The repo is used by international corporations and international users worldwide. Although English is primarily recognized, there may be users who will better benefit from a Chinese translation.

URL

https://github.com/openstreetmap/iD/blob/develop/README.md

How to reproduce the issue?

n/a

Screenshot(s) or anything else?

n/a

Which deployed environments do you see the issue in?

The most up to date version of iD

What version numbers does this issue effect?

The most up to date version of iD

Which browsers are you seeing this problem on?

Chrome

[pnorman]

What languages would the readme need too be translated into, and who would both translate it and keep it up to date?