TS65 Split Mechanical Keyboard Case

This is a minimal case for the [TS65AVR](https://github.com/mohitg11/TS65AVR), which is fully 3d printable. It aims to be:

* Easy to print and build
* At the intersection of "small" and "comfortable", and not much larger than the PCB
* Reasonably good to look at
* Easy to iterate on

The keyboard's original name was "Sandwich", explaining the filenames. However "Sandwich" tends to have a specific meaning among mechanical keyboard folk—so I wouldn't describe it as such—but it is, in the sense that you sandwich the top, bottom, and key plate. The advantage is you can change the case around the plate without having to de-solder the keys, so long as you're happy with the plate design. This design came out of a conversation with my friend [@coddingtonbear](https://www.thingiverse.com/coddingtonbear), who has also [designed a keyboard](https://www.thingiverse.com/thing:3080916) around this idea.

The Fusion 360 `.f3d` is included so you can make changes as necessary.

# Parts