4 data modelling

[abraham-rostampoor]

This PR introduces four JSON schema files to establish a clear data structure for our Firebase collections. These schemas are critical for guiding the development process, ensuring data consistency, and providing a blueprint for setting up Firebase Security Rules. Here's a brief overview of each schema:

• USER.json: Defines the structure for user documents, including authentication and contact information.
• RESTAURANT.json: Lays out the details for restaurant documents, including the data necessary to support listing restaurants and their average ratings.
• FOOD.json: Describes individual food items with nutritional information, which will be used within the restaurant menus.
• MENU.json: Represents the collection of food items offered by a restaurant, linked within the restaurant's document.

[johnmck95]

Food table will additionally need:

• Foreign key for the restaurant (restaurantUid)
• Food categories (fresh_fruit, fresh_veg) - boolean values
• Not storing the restaurant data - we'll only use the restaurant name and use google APIs to calculate distance.