What Iv'e done now is put the readme.txt in the FeralHeart folder, and I've named it items. However it won't let me replace the items.cfg, so I've left the readme.txt (items) next to the items.cfg......
IN A NUTSHELL-
(It won't let me replace the items.cfg file for the readme.txt and it won't let me copy and paste the items in the readme.txt into the items.cfg)!
I know it's all probably really simple and I sound like a real idiot but there we go.