Add airplay option
Add airplay option

Allow user to choose to install shairport-sync for IOS airplay support.
renekliment/AlexaPi,ImEmJay/AlexaPi,sammachin/AlexaPi,alexa-pi/AlexaPi,ImEmJay/AlexaPi,sammachin/AlexaPi,renekliment/AlexaPi,alexa-pi/AlexaPi,fcojersanchez/AlexaPi,fcojersanchez/AlexaPi