[2 pts] Implement methods(member2)

[0sugo]

• add_item method in the Genre class
  • should take an instance of the Item class as an input
  • should add the input item to the collection of items
  • should add self as a property of the item object (by using the correct setter from the item object)
• can_be_archived?() in the MusicAlbum class
  • should override the method from the parent class
  • should return true if parent's method returns true AND if on_spotify equals true
  • otherwise, it should return false