add audio folder to gitignore
add audio folder to gitignore

inspiredtolive/Picky-Notes,derektliu/Picky-Notes,folksy-squid/Picky-Notes,folksy-squid/Picky-Notes,derektliu/Picky-Notes,folksy-squid/Picky-Notes,inspiredtolive/Picky-Notes,inspiredtolive/Picky-Notes,derektliu/Picky-Notes