input: Write a python function to add corresponding elements of two lists.
  assert add_lists([1, 2, 3], [4, 5, 6]) == [5, 7, 9]
  assert add_lists([10, 20, 30], [1, 2, 3]) == [11, 22, 33]
  assert add_lists([0, 0, 0], [0, 0, 0]) == [0, 0, 0]
output: def add_lists(list1, list2):
      return [a + b for a, b in zip(list1, list2)]