First version of the readme...

README.md

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-# godot-procedural-textures
-A procedural textures addon for Godot
+This is an addon for the Godot game engine that can be used to create texture procedurally.
+
+Its user interface is based on Godot's GraphEditor: textures are described as interconnected texture generators and operators.
+
+![Screenshot](doc/screenshot.png)
+
+## Generators
+
+### Image
+
+This operator reads a bitmap from disk
+
+### Sine
+
+This generator creates sine wave based vertical bars.
+It will soon be replaced with a more flexible generator (similar to the PatternFunction in NeoTextureEdit)
+
+Its parameters are the number of bars and a multiplier applied to the sine wave (higher values will make the bars sharper).
+
+![Sine pattern](doc/sine.png)
+
+### Bricks
+
+This generator creates bricks greyscale patterns.
+
+The Bricks generator has 5 parameters:
+* the number of brick rows
+* the number of bricks per row
+* the offset between even and odd rows
+* the mortar space between bricks
+* the bevel at the edge of the bricks
+
+![Bricks pattern](doc/bricks.png)
+
+### Perlin Noise
+
+The Perlin Noise generator creates a greyscale pattern and has 4 parameters:
+* the horizontal and vertical scale of the first iteration
+* the number of iteration
+* the persistence (the weight ratio between 2 iterations)
+
+![Perlin Noise](doc/perlin.png)
+
+### Voronoi Noise
+
+The Voronoi Noise generator creates greyscale patterns based on Voronoi diagrams and has 3 parameters:
+* the horizontal and vertical scale (the number of feature points)
+* the "intensity" of the noise (used to adjust the generated color)
+
+![Voronoi Noise](doc/voronoi.png)