Class: Playlist

Attributes:
Genre (array)
Artist (array)
Album (array)
MP3Compatible (boolean)
NumberOfSongs (integar)
LengthOfPlaylist (float)
PlaylistName (string)

Methods:
AddSong (increase number of song to total and add to arrays)
SongsRemaining (take number of songs played subtracted from total)
AlphabetizeSongs (take items in array and compare first letters)
TimeRemaining (would subtract time played from overall length)
Rename (change playlist names)
CurrentSong (total number of songs minus songs played)