Updated README.md to add link to sokol_color.h

README.md

@@ -49,6 +49,7 @@ useful details for integrating the Sokol headers into your own project with your
 - [**sokol\_debugtext.h**](https://github.com/floooh/sokol/blob/master/util/sokol_debugtext.h): a simple text renderer using vintage home computer fonts
 - [**sokol\_memtrack.h**](https://github.com/floooh/sokol/blob/master/util/sokol_memtrack.h): easily track memory allocations in sokol headers
 - [**sokol\_shape.h**](https://github.com/floooh/sokol/blob/master/util/sokol_shape.h): generate simple shapes and plug them into sokol-gfx resource creation structs
+- [**sokol\_color.h**](https://github.com/floooh/sokol/blob/master/util/sokol_color.h): X11 style color constants and functions for creating sg_color objects
 
 ## Notes