RPN+Calculator+Addition

As a user, I want to be able to add two numbers so that I don't have to do the work manually

UAT

 * [] 8 5 -> [13]
 * [] 8 -> [8]
 * [] 8 -> [8]
 * [] -3 7 -> [4]
 * [4, 5, 3] -> [4, 8] -> [12] -> [12]

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