Add parallax shader

Add a "simple" parallax shader based on raymarching. Features:

* Three parallax planes.
* Each plane can be textured with PBR textures.
  * Base color with alpha, normal, roughness, and metallic are
    implemented.
* Each plane has these configurable properties:
  * Depth. Higher values create stronger parallax.
  * X and Y scale.
  * Emission strength.

1 files changed, 22 insertions, 0 deletions

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..86c1541
--- /dev/null
+++ b/README.md
@@ -0,0 +1,22 @@
+# Soggy Shaders
+
+A collection of shaders by yum\_food.
+
+MIT licensed: feel free to modify, redistribute, and sell!
+
+To use, clone this repo somewhere inside your Unity assets folder.
+Then assign the shader you want (like yum\_food/parallax) to a material.
+
+Please ask setup questions [on the discord](https://discord.gg/YWmCvbCRyn).
+
+## Parallax
+
+![Parallax demo](Demos/parallax_demo.gif)
+
+A simple parallax shader with three parallax planes. Each plane can be textured with PBR textures: base color, normal, metallic, and roughness. The size, depth,
+and emission strength of each plane is configurable.
+
+In these demos, I have the shader on a quad.
+
+Full demo video [here](https://youtu.be/WvPdqxmrZzI).
+