Add OpenSCAD

[kenchou]

OpenSCAD is a software for creating solid 3D CAD objects. SCAD stands for "Scripted CAD", where CAD is an acronym for "Computer-Aided Design".

• https://github.com/openscad/openscad
• https://openscad.org/documentation.html#language-reference

[XAMPPRocky]

Thank you for your PR, and congrats on your first contribution! 🎉