added a build file for SBT

Signed-off-by: Nicolas Cailloux <caillouxnicolas@gmail.com>
moved sources to a directory for SBT

Signed-off-by: Nicolas Cailloux <caillouxnicolas@gmail.com>
added chords in resources directory

Signed-off-by: Nicolas Cailloux <caillouxnicolas@gmail.com>
fixed the build file

Signed-off-by: Nicolas Cailloux <caillouxnicolas@gmail.com>
moved images to sbt "resources" directory

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