Demon slayer (Kimetsu no Yaiba)

At the moment, the mod adds Tanjiro's katana from the anime "Demon Slayer" and new food.

• Added the sword itself and the ability to create it on an anvil. The sword also has slightly changed effects during ultimatums.

• Added a new food: "onigiri". 

This is my first mod I've made in my life, and I'd appreciate any feedback. I also plan to expand the mod beyond just swords.