Particle Mesh Feather Case

Here's a case that works with the Feather-compatible Argon and Xenon (Boron compatibility hasn't been tested).

Argon: There is a cutout in the back of the case for the Argon's Wifi antenna (fish it through and connect before enclosing).

Magnetic cover: There is a cover with slots cutout for a badge magnet, so that the headers can be exposed on the bottom for free-wiring.

Magnets: A compatible badge magnet can be found here, on [Amazon](https://smile.amazon.com/totalElement-Magnetic-Fas