Step 1 - and two numbers again

* Clearly the above code is suspect so added a test to fail Added test
testAddTwoNumbers1and3 - Tests that passing 2 numbers returns their sum.
* Refactored code to split the numbers if a "," is in the input.
* looking at Add we now have 3 Integer.ParseInt(String) is going to be
popular so pulled that out to a getInt(String).