This is not implemented in the slightest yet but I wanted to lay it out in advance. This was put together in photoshop but I wanted to make it look similar to how it would once implemented.
How It Works
The RED inventory slot indicates that the Wall item can not be crafted because of the missing Wood.
The GREEN inventory slot indicates that the Stone Tile item can be crafted since all the required items are available.
Modded Crafting Recipes
That's how setting up a new crafting recipe works. Make sure the name is the same as the item in the game and make sure that the required items are the same as well. The program will connect them within its database automatically.