Simple ALU
----------
Inputs A, B of 8 bits (operands)
Output Y of 8 bits (output)
Input C of 2 bits (control)
Input clock, input reset
Output Y = A oper B // oper is based on C
c == 00 oper is addition;
c == 01 oper is subtraction;
c == 10 oper is multiplication;
c == 11, oper is logical XOR operation
