Write a predicate isort that sorts a list of integers using the insertion sort method. the insertion method starts with an empty list and inserts items one at a time into the correct position. ? - isort ([7, 3, 5, 4, 1, 2, 6], [1, 2, 3, 4, 5, 6, 7]). true. ? - isort ([7, 3, 5, 4, 1, 2, 6], i). i = [1, 2, 3, 4, 5, 6, 7].