Update interface Readme



#include
#include
void init (void)
{
glClearColor (1.0, 1.0, 1.0, 0.0);
glPointSize (4.0);
glMatrixMode (GL_PROJECTION);
glLoadIdentity ( );
gluOrtho2D (-50.0, 50.0, -100.0, 100.0);
}