Adds (A | Carry) + B inputs and displays the result.
Carry in allows for grouping this circuit to perform binary addition by attaching the carry out to the next adder carry in.
Used in the ALU of a CPU for binary addition (as a chain where this would be for one bit).
Top input: Carry-in
Middle Input: A
Bottom input: B
Left LED: Carry Out
Right LED: Sum
0 + 0 = 0
1 + 1 = 0 & Carry
1 + 0 = 1
1 + Carry = 0 & Carry
