Added mention of glFrontFace to README.md

README.md

@@ -74,6 +74,7 @@ The data for the whole frame is buffered and flushed in `nvgEndFrame()`. The fol
 	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 	glEnable(GL_CULL_FACE);
 	glCullFace(GL_BACK);
+	glFrontFace(GL_CCW);
 	glEnable(GL_BLEND);
 	glDisable(GL_DEPTH_TEST);
 	glDisable(GL_SCISSOR_TEST);