Add new futures and Improve Ui and UX

version 3.0 :

Custom Mp3 music select option ( also delete, add mp3 music files into app music list )

Support Mp3 audio files only ( Other file formats just convert to mp3 )

Now you select your favorite Mp3 music for timer finish alert music

Now you can easily Single or Multiple files into single click

UI changed performance improved

Reset button size changed

UX improved