added ASHIMA.md file.

ASHIMA.md

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+*webgl-noise* contain Simplex Noise functions that are fast and 
+self contained, with performance that scales well with massive
+parallelism.
+While not quite as fast as Gustavson's original implementation
+on typical current desktop GPUs, they are more scalable to
+massive parallelism and much more convenient to use, and
+they can make good use of unused ALU resources when run
+concurrently with a typical texture-intensive rendering.
+Gustavson's implementation makes heavy use of a texture
+lookup table and is texture bandwidth limited.
+ 
+This work follows Stefan Gustavson's paper "Simplex noise demystified"
+http://www.itn.liu.se/~stegu/simplexnoise/simplexnoise.pdf
+without using any uniform arrays or texture engines.
+
+Simplex noise functions are (C) Ashima Arts
+Classic noise functions are (C) Stefan Gustavson
+
+###License
+[MIT Expat](http://ashimagroup.net/os/license/mit-expat)
+
+###Tags
+[webgl](http://ashimagroup.net/os/tag/webgl)
+