Add CMake scripts to D3D11/D3D12 demos

[ModulePillow]

This change helps other users, one command can generate a VS solution regardless of which Visual Studio IDE users have.

e.g.
cd ./demo/d3d12
cmake -S ./ -B ./cmake

[igromanru]

I don't know much about CMake. But shouldn't there be a CMakeLists.txt ?
How do I build it with Native Tools Command Prompt from VS 2022?

[ModulePillow]

I don't know much about CMake. But shouldn't there be a CMakeLists.txt ? How do I build it with Native Tools Command Prompt from VS 2022?

VS (exactly, it's MSBuild of VS) is a build system. CMake is a management system for all build systems.

I don't know much about VS Native Command; u can create an empty VS C++ solution on the GUI, and manually put .h/.cpp into it.

That's where CMake shines; several lines of CMake scripts define a whole project.