Adding Book and Label classes

[orozCoding]

In this branch, I created the Book and Label classes

Book class

All Book class properties visible in the diagram are defined and set up in the constructor method.

Implemented the can_be_archived?() method to the Book class: it overrided the mIethod from the parent class It returns true if parent's method returns true OR if cover_state equals to "bad", otherwise, it returns false

Label class

All Label class properties visible in the diagram are defined and set up in the constructor method.

Implemented methods: add_item

• It takes an instance of the Item class as an input
• It adds the input item to the collection of items
• It adds self as a property of the item object (by using the correct setter from the item object)

[orozCoding]

Thank you @TimmyChan99