Create a .dmg OSX install file from a simple C++ application

Coder/Developer needed to create .dmg (Mac OS) install file from simple CPP (C++) application. I have tweaked some text in the source code to this simple Open Source application (https://danielnoethen.de/butt/) . The original has both a .exe and .dmg for users. I only know how to compile and create an install file for Windows. I need someone to take the new source code (almost identical to that on the URL) and create the .dmg install file, so a Mac user can use on their system.