Update page 'Day 5 homework - Sloetjes'

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 # Xuanyi Wang\_Day-5\_Homework\_04/05/23
 The assignment for tonight is to write a class named Vault containing an attribute named "treasure" which returns "gold" under normal circumstances, but a warning message such as "attribute deleted!" if it detects any of its attributes have been changed.  You can use the descriptor protocol (__set__, etc) to detect if its attributes have been changed, and it will have to check its own __dict__ against a known good copy before accessing the treasure attribute to make sure that the attributes are what they're supposed to be.
 ```
 class Vault:
    def __init__(self):
        self._treasure = 'gold'
        self._original_attrs = self.__dict__.copy()
    @property
    def treasure(self):
        if self.__dict__ != self._original_attrs:
            print('Attribute deleted!')
        return self._treasure
    def __setattr__(self, key, value):
        self.__dict__[key] = value
        if key != '_original_attrs' and self.__dict__ != self._original_attrs:
            print('Attribute deleted!')
 ```
 ##### An example usage of the 'Vault' class:
 ```
 v = Vault()
 print(v.treasure)  # prints 'gold'
 v.x = 10
 print(v.treasure)  # prints 'Attribute deleted!\ngold'
 ```