Add sleep timer feature to simple music player

Component
Sleep timer is an important feature on every music player, but such feature is lacking on simple music player. Most users prefers sleep timer on their music player because it saves their battery life.

Proposal

If the above mentioned feature is added to simple music player it will help it users to set time frame for the app to stop playing the selected playlist.
Maybe while sleeping or having low battery, the users can easily set a particular time frame where he/she want the app to stop the playing file.

Mockups / Examples

Benefits

Adding sleep timer to this app will make it stand out among most music player. As sleep timer is an important feature on every music player, it will attract more users and also be as a plus to open source.