[Samples] Add HelloWorld Direct3D12 sample
[Samples] Add HelloWorld Direct3D12 sample

TechPriest/SharpDX,weltkante/SharpDX,waltdestler/SharpDX,jwollen/SharpDX,davidlee80/SharpDX-1,PavelBrokhman/SharpDX,Ixonos-USA/SharpDX,waltdestler/SharpDX,RobyDX/SharpDX,TechPriest/SharpDX,weltkante/SharpDX,Ixonos-USA/SharpDX,jwollen/SharpDX,mrvux/SharpDX,jwollen/SharpDX,davidlee80/SharpDX-1,jwollen/SharpDX,davidlee80/SharpDX-1,mrvux/SharpDX,Ixonos-USA/SharpDX,RobyDX/SharpDX,waltdestler/SharpDX,andrewst/SharpDX,andrewst/SharpDX,fmarrabal/SharpDX,dazerdude/SharpDX,TechPriest/SharpDX,sharpdx/SharpDX,dazerdude/SharpDX,sharpdx/SharpDX,PavelBrokhman/SharpDX,PavelBrokhman/SharpDX,dazerdude/SharpDX,PavelBrokhman/SharpDX,manu-silicon/SharpDX,andrewst/SharpDX,mrvux/SharpDX,weltkante/SharpDX,waltdestler/SharpDX,manu-silicon/SharpDX,RobyDX/SharpDX,manu-silicon/SharpDX,manu-silicon/SharpDX,RobyDX/SharpDX,TechPriest/SharpDX,fmarrabal/SharpDX,fmarrabal/SharpDX,weltkante/SharpDX,fmarrabal/SharpDX,dazerdude/SharpDX,Ixonos-USA/SharpDX,davidlee80/SharpDX-1,sharpdx/SharpDX