Create a function where an owner can play with a specific cat

[nickmckay]

Write a function called play(Cat) to play with the cat specified by the "Cat" parameter. When the cat is played with its energy parameter decreases by 1 and its mood parameter increases by 1.

• Write the play() function in the Owner class in human.py.
• Edit the docstrings for this function, including usage a example.
• Create a test for the new function.

[Dewan-cpu]

Please count me in