Raspberry-Pi Zero PCB/Board

This is a placeholder/model for the Raspberry-Pi Zero, after the [mechanical drawing on element14](https://www.element14.com/community/docs/DOC-79288/l/raspberry-pi-zero-technical-details)

NOTE: while the PCB itself is exact to the specification (including holes and rounded corners), the correct placement and size of the components is NOT guaranteed - best effort here :-P (the pi-zero is still hard to get hold of as of yet, so no chance to verify anything...)

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*Update 2016-02-08*: adjusted usb and hdmi positions after element14 reference

*Update 2016-03-13*:
finally got my hands on a pi-zero, added a model that is based on caliper measurements of it - so still no guarantees, but one better :-)