Add "Like" to the menu

[evgkirov]

It would be nice if I could "like" songs from the app menu.

[shamrin]

Good feature. But I don't want to implement it myself. I prefer to implement issue #16 instead: embed the whole player widget in the menu and solve this and other possible requests (repeat, shuffle, album picture). But I'm open to pull requests with the implementation of "Like" menu item :)