Add the design files for the librem5-devkit printable case.

The original design was by MrPickle

https://www.youmagine.com/designs/librem5-devkit-case

Openscad adaptation by Angus Ainslie <angus.ainslie@puri.sm>
Status Job ID Name Coverage
  Build
failed #9224
build

 
  Test
skipped #9226
allowed to fail
code_quality
skipped #9225
test
 
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