new enchantment: hardhit

the hardhit enchantment is fairly simple, it allow you to have a chance to get a critical hit when you are not in the air. hardhit 1 will give the player a 15% chance of getting a critical hit. hardhit 2 will increase this chances to 25% of a critical hit and hardhit 3 will give you a 40% of a critical hit. i think its a balanced enchantment because its kind of annoying to jump to get a critical hit so i just hope you at least read this