acceptance criteria
what is AC-
AC are conditions which will tell us 
whether specific criterias are met so we
consider user story is DONE.
Example of AC-
As customer I should be able to pay with credit card
so I dont have to pay cash
AC-
-USER SHOULD BE ABLE TO PAY WITH VISA CARD
- ""    ""   ""    ""       ""   MASTER CARD
- ""             ""         ""   AMEX CARD
USER SHOULD BE ABLE TO PAY WITH ANY THIS 3 TYPE OF
CREDIT CARD BY ENTERING CARD OWNER NAME, CARD NUMBER
AND EXPIRATION DATE AND SECURITY CODE
