macOS quick start guide

WARNING: Due to Apple dropping OpenGL support rendering on macOS is currently unsupported. We still support UnitTests on macOS. The support will return with the new renderer implementation that is WiP right now.

1. Fork necessary repositories:
   • Engine at https://github.com/KNTGPolygon/PolyEngine
   • Example projects at https://github.com/KNTGPolygon/PolyEngineExamples
2. Clone those repositories to your Mac
3. Install:
   • Xcode + command line developer tools
   • Homebrew from here.
4. Install following packages from homebrew:
   • pkgconfig
   • qt5
   • cmake
5. Use InitializeSubmodules.py script to initialize all submodules, update them and apply our patches.
6. Use ProjectTool.py script to create solution file for game project or just for engine (-p option). That's it.