Add xor_gate
Add xor_gate

yukihirai0505/tutorial-program,yukihirai0505/tutorial-program,yukihirai0505/tutorial-program,yukihirai0505/tutorial-program,yukihirai0505/tutorial-program,yukihirai0505/tutorial-program,yukihirai0505/tutorial-program,yukihirai0505/tutorial-program,yukihirai0505/tutorial-program