Make sure to use the lastest Forge Version, from 14.23.5.2847 it's ok.
As simple as it is, adds a new Stone Armour, better than a leather Armor and Inferior to an Iron Armor, with of course less durability.
The crafting recipe uses STONES, NOT cobblestones. The way you make the Armour is the same you'd do as if it was a normal armour.
Confermed JEI compatibility , and it should work with every other mod.