Switch from dt to dial for 10- 30 rhythm circles composition
modify speed and size of circle
collision on
add shape color
add triggered animation
add Cocoa GUI
test commit from Xcode to check it from github.app
Revert "test commit from Xcode to check it from github.app"

This reverts commit 45d5a25f801f872c8e89360828c30b762292913e.