added cura, mindustry and wondershaper

[picarica]

i had these packages in my repo, got reccomended to add it here, as a proxy maintaner, am i correctly here?, i wanted to add packages as proxy maintener or anything, just want my packages in repo so it is accesible globaly

all packages tested and in use, only problems are missing icons, dont know how to make them

[stkw0]

This is just a mirror. The repository is located at https://github.com/gentoo/guru, though you can also request access to GURU to commit it yourself. See https://wiki.gentoo.org/wiki/Project:GURU/Information_for_Contributors