Because I desperately searched for something like that and found nothing, I just wrote a tutorial myself on how to start with the Xilinx PlanAhead workflow in ISE 14.7 when using the Digilent ZYBO board. Though I made this with the ZYBO in mind, the general workflow also applies to ZedBoard users and probably general Zynq boards as well.
It can be found at http://sunsided.github.io/zybo-tutorial/.
Basically the tutorial explains in about 120 pictures how to implement
LEDs <= Switches xor Buttons;
using the Xilinx tools. You can also find that nice picture of my fingers there, too.
If that ain’t something!