Add Windows support

[freakboy3742]

Glib and GTK support Windows; so should Gbulb.

There's a (very old) WIP branch.

Any proposed solution should also add a CI configuration, and remove the note in the README.

[RobotnickIsrael]

I would like to try working on windows patch, anyone can tell me why previous tries failed? Any other leads I should know about?
There is the old branch, but its about 7 years ago, I'm not sure I should even try to work with it

[freakboy3742]

@RobotnickIsrael I only took over maintenance of the project recently, so I don't know the history; however, if I had to guess, it will be because (1) Windows Socket handling is very different to Unix socket handling, and (2) Windows asyncio uses a Proactor, not a Reactor. I have no idea if the WIP branch will be of any use as a starting point. You're welcome to try your hand at a fix, though.

[gbtami]

You may get some ideas from https://github.com/harvimt/quamash/tree/master/quamash