First update of recipe app

Project details:

Login page and registration page:

• Should be built with Devise.
• Food list (only for a group that has less than 3 members):
• Should display a list of food added by the logged-in user as in the wireframe (display also quantity of a given food).
• Should lead to a form that allows users to add new food

Recipes list:

• Should display a list of recipes created by the logged-in user as in the wireframe.
• Should lead to recipe details.
• If the user is the owner of the recipe, should allow the user to delete it.

Public recipe list:

• Should display a list of all public recipes ordered by newest as in the wireframe.
• Should lead to recipe details.

Recipe details:

• Should display a toggle button that allows for a recipe to be made public or private.
• If the recipe is public or the user is the owner of the recipe, should display the recipe details as in the wireframe.
• If the user is the owner of the recipe, should lead to the form that allows the user to add new food.

General shopping list view (only for a group that has less than 3 members):

• Should show the list of food that is missing for all recipes of the logged-in user (compare the list of food for all recipes with the general food list of that user).
• Should count the total food items and total price of the missing food.
• There are no N+1 queries happening.