Add XING network

Hi. Is it possible to at XING as a new network to share links to via popup? This one is quite famous in Europe (especially in Germany), compared to LinkedIn. I was looking into adding it via pull request but struggled to understand how you create the glyphs and fonts. According to the docs it looks quite similar to how FB and Twitter work.

https://dev.xing.com/plugins/share_button/docs

Regards,
Stephan