Cole has been an absolute machine working on this - we'd love your help! Net, though, is that extending Kubernetes in this way is available to everyone - we support ~15 different cloud and OS configurations today, we'd love to support more!
Not sure if you are serious, but while Azure is from Microsoft, it is definitely not Windows only. In fact, most of the products coming out of the "new" Microsoft pipeline aren't in any way tied to Windows.
Kudos to them, and awesome to see people working to get Kubernetes to work on Azure.