removed / renamed old files

Signed-off-by: Nicolas Cailloux <caillouxnicolas@gmail.com>
updated .gitignore

Signed-off-by: Nicolas Cailloux <caillouxnicolas@gmail.com>
first draft: Chord+Note, MidiPlayer, and a main program to test all that

Signed-off-by: Nicolas Cailloux <caillouxnicolas@gmail.com>
added README

Signed-off-by: Nicolas Cailloux <caillouxnicolas@gmail.com>