input: Write a python function to generate a list of numbers from start to end (inclusive).
  assert generate_list(1, 5) == [1, 2, 3, 4, 5]
  assert generate_list(5, 10) == [5, 6, 7, 8, 9, 10]
  assert generate_list(0, 3) == [0, 1, 2, 3]
output: def generate_list(start, end):
      return list(range(start, end + 1))