Test for initial Add method with up to 2 numbers
Add Calculator with Add method
Add autoloader and bootstrap so test can find the class
Allow an unknown amount of numbers as input
Allow add to support different and mixed delimiters
Add support for customer delimiters
Throw exception if there is a negative number in the input
Ignore large numbers in calculation
Customer delimiters with length longer than 1 have a different syntax
Support multiple delimiters and different lengths