Fix feature demo youtube link

Update README.md

Add color and low-res support

Rename Ramp textures, factor out textures path into a constant

Create ramp textures as regular PNG files, and set proper import settings on them

Optimize shader by splitting 3D texture into two (3D + ramp)

Fix player buids (move Dither3DTextureMaker to Editor folder)

Ignore Rider IDE temporaries

Update README.md

Update README noting Unity 6 support

Add copyright and license info to source files

Discussion in README file of surface-stable trait

Initial commit