Ajout de d3dx11.sdk directx11 and sample code

[TouEnMasm]

Hello,
The actual windows sdk don't give all the the directx headers.
Those ones provide from the directx sdk.
There is severall includes coming with the d3dix11,all are here http://luce.yves.pagesperso-orange.fr/header.htm
Attached is a sample code with only the the D3DX11 window.