Add a readme

README.md

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+
+# GLdc
+
+This is a partial implementation of OpenGL 1.2 for the SEGA Dreamcast for use
+with the KallistiOS SDK.
+
+It began as a fork of libGL by Josh Pearson but has undergone a large refactor
+which is essentially a rewrite.
+
+The aim is to implement as much of OpenGL 1.2 as possible, and to add additional
+features via extensions.
+
+Things left to (re)implement:
+
+ - Fog
+ - Near-Z clipping
+ - Spotlights and point lights
+ - Framebuffer extension
+ 
+Things I'd like to do:
+
+ - Use a clean "gl.h"
+ - Define an extension for modifier volumes
+ - Support `GL_ALPHA_TEST` using punch-thru polys
+ - Add support for point sprites
+ - Optimise, add unit tests for correctness
+ 
+