Set up the admin panel options

[Ramin-RX7]

In admin panel we need to register our models with out own custom options:

This means you have to implement fields for these models:

• Order
• Food
• Category
• Table
• User

Each has their own attributes (beside fields):

Order

• in order details, user has to be able to see it's OrderItems
• Filters:
  • Today orders
  • orders that are not paid yet
• Order by date created and modified
• search using phone, order item, status

Food

• Search for foods in their name, category
• Filter to see inactive foods (Not implemented yet, add it to the Food model)
• order foods by their name

Category

• Search in their names
• Filter to see categories without any foods
• In the details page, see the foods in the category

Table

• see the order of the table in the details page

User

• Search in first_name,last_name,phone
• filter to see if they are staff, and if they are not
• filter to see active/inactive users
• filter to see superusers

[Ramin-RX7]

completed in #127