ASIO SDK files required for building the standalone app on windows

the files from the ASIO SDK are included with rtaudio and are also available from steinberg.

RTAudio http://www.music.mcgill.ca/~gary/rtaudio/

copy the files from the rtaudio "include" folder here

asio.cpp
asio.h
asiodrivers.cpp
asiodrivers.h
asiodrvr.h
asiolist.cpp
asiolist.h
asiosys.h
dsound.h
ginclude.h
iasiodrv.h
iasiothiscallresolver.cpp
iasiothiscallresolver.h
soundcard.h