Update README.md
Fix lingering problems
License
The build guide can be found at https://slider.clifford.lol/build-guide/.
In src
you will find the SLIDER box Solidworks source files (I know it's
proprietary, sorry, I didn't have time to use FreeCAD while doing the project,
lol).
In export
you will find the SLIDER box parts in a variety of interoperable
formats.