Update User Stories for Pantry data

As a user, I should be able to view what ingredients exist inside of my pantry.
As a user, I should be able to check my list of recipes to cook and see if my pantry has enough ingredients to cook a meal.
As a user, I should be told what ingredients are still needed if I don’t have enough ingredients in my pantry to cook the recipe.

Lexyful / What-s-Cookin