Update primeNumbers.py

I added the class like I think he wanted us to do and other than that I just fixed a few syntax things so it would compile in Pycharm. I added parentheses around the print statement because the compiler was yelling at me if I i didn't but it may work just fine with whatever you were using.  I'm not too sure because I'm just learning python.
Merge pull request #1 from g-rich1234/master

Update primeNumbers.py