[1pt] Implement methods in the Game and Author class (Team member #3)

[devMunyi]

• Implement methods:
  • add_item method in the Author 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 Game class
    • should override the method from the parent class
    • should return true if parent's method returns true AND if last_played_at is older than 2 years
    • otherwise, it should return false

[kene-creator]

hi @devMunyi , I'll need a review for my pull request #84