Create/Add KDE Plasma 5 Theme

I'm not sure how prevalent this is but Gnome has always been a pain to customize and I'm sure @EMH-Mark-I can attest to the lack of documentation. With a Gnome foundation member stating Gnome should move away from themes (https://samuelhewitt.com/blog/2018-08-05-moving-beyond-themes) I'm thinking I'd like to try adding Plasma 5 theme instead.

Instructions can be seen here: https://techbase.kde.org/Development/Tutorials/Plasma4/Theme it seems like its more SVG based than some quasi CSS.