Add support for Linux

[martinseener]

Hi and thanks for this great project! As i'm both a Mac and Linux user (Home / Work) i appreciate your work greatly on my Mac but for work i still have to use the crappy music.apple.com website. Since Swift is also available for Linux, is it maybe possible to add some kind of Linux support for your project?

[revblaze]

I'll see what I can do after I finish and push Public Beta 2 (webkit/fx). 😊👌