Storing and summing!

Code now sums both numbers and stores them in AX (at line 102 this is
true, after that could change) and var3 (won't change). Still needs to
check next number to see if greater/lesser/equal. Verify code works with
inputs like III+II, V+V, stuff like that. Verify code doesn't work with
inputs like IV+I. You'll have to use debug and trace to see the values
though, we'll have to change the output code to see the values there.