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