Switched from NVX to stabilized NV extension

Version_2_2

* replaced copied-from-sdk Vulkan headers with submodule pointing to …

Version_2_1: * Fixed refraction code (thanks to @sergeyreznik for pointing out)

* Changed ior to ice (better looking)

Version_2_0

* increased maximum bounces count to 10 for better refractions (our b…

Happy Triangle! (with fixes)

happy_triangle_fixed

Merge branch 'master' of https://github.com/iOrange/rtxON

Happy Triangle!

Create README.md

+ Added a README file with some build instructions