added rspec
Add empty file so rspec has something to refer to
Add rspec file
Added tests
Fixed error in the call to CreditcardValidator
Added invalid input checks
Added card type
started adding number validation logic
added more number validation logic
refactoring
modified output message
fixed syntax error in spec
implemented the wrong version of the luhn algorithm
refactoring
refactoring
refactoring
trying to get specs to run - failed