Added link to controller github

Added the link to the github information about the
ELB_FULL_GRAPHIC_CONTROLLER

Marlin/Configuration.h

 //#define VIKI2
 //#define miniVIKI
 
-// This is a new controller currently under development.  A link to more information will be provided as it
-// becomes available.
+// This is a new controller currently under development.  https://github.com/eboston/Adafruit-ST7565-Full-Graphic-Controller/
 //
 // ==> REMEMBER TO INSTALL U8glib to your ARDUINO library folder: http://code.google.com/p/u8glib/wiki/u8glib
 //#define ELB_FULL_GRAPHIC_CONTROLLER