Add the option Add selection to playlist in the menu, to help add selected folders to playlist

[marek-lach]

Suppose we cannot use a mouse and do a right click. In the menu where there are currently options like Remove selection from playlist, also add Add to playlist, or something like Add selection to playlist, so when a folder is selected it can be added to a playlist all at once using the keyboard, or touch gestures, without the need for the use of a mouse.

Thank you,