This is to add a separate Makefile for the Leapfrog devices (primarily Leapster Explorer and LeapsterGS Explorer), intended to be used with the Retroleap project (https://github.com/mac2612/retroleap) The Leapster Explorer SoC is essentially the same as the Miyoo v1, and as such I've based it on the Makefile for this device, but intend making a few config changes after a bit more testing and tailoring to both LF devices.
