Based on : https://github.com/Bizzaro/x230-osx and https://github.com/xxx10101xxx/ThinkPad-X230-macOS
My version is for i5 3320m
Differences with xxx10101xxx version: i don't use his "EFI" folder.
Soon maybe i will write a guide.