gfx-backend-vulkan 0.4.0

Vulkan API backend for gfx-rs
Documentation 
# gfx-backend-vulkan

[Vulkan](https://www.khronos.org/vulkan/) backend for gfx-rs.

## Normalized Coordinates

Render | Depth | Texture
-------|-------|--------
![render_coordinates](../../../info/vk_render_coordinates.png) | ![depth_coordinates](../../../info/dx_depth_coordinates.png) | ![texture_coordinates](../../../info/dx_texture_coordinates.png)

## Mirroring

HAL is modelled after Vulkan, so everything should be 1:1.