Tiny 2040 case

This is a minimalistic case for the [Pimoroni Tiny 2040](https://shop.pimoroni.com/products/tiny-2040).

The reset and boot buttons are exposed, and the layer above the LED is thin enough to see the LED when lit up. There is a slight recession in the bottom part to give the parts on the underside of the board enough room.

The top and bottom parts of the case have a slight ridge so that they hold together snug and tight when assembled.