Raspberry pi Zero simple model

Designed with Autodesk fusion 360.

Right now it's just the pcb with a simple model of usb ports. Could be used as a guide to design cases, for example.

Maybe the design will be changed over time. I'll try to keep everything updated [here](http://a360.co/2exnHNi) but, if you want, you can check the lasted design here to see if anything have changed or export it to another project.