Right now, it's empty but it's worth a watch as code will be appearing there soon.
The aim is to license the code using the Apache Software Licence as the code is added so that everyone can use it with as little restrictions as possible. After all, this is learning material!
In addition, the hope is that others might extend the ideas into new implementations and repositories of their own, and perhaps ask for those repos to be formally associated with this GitHub org. As long as the licenses are open then I'd be very keen to hear in time from others who would like to contribute their own samples to this reference organisation.