This mod is simple and self explanatory. It adds a recipe for the bottles o enchanting. The recipe is one diamond above a empty glass bottle. It doesnt matter where in the crafting bench as long as the diamond is above the bottle. This will give you 5 bottles of xp. If I have someone request it i will put in a config file to allow you to edit the amount of bottles you receive but for now it is fixed at 5 bottles. I think that is fair for 1 diamond.
Looks interesting, but only 5 bottles is an extremely small amount considering you only will get about 1-2 levels. Maybe if you made it out of something like redstone and lapis, but diamond is way too expensive.