input: Write a function to check if an element exists within a given list of integers. If the element is found in the list, return True, otherwise return False.
  assert element_exists(5, [1, 2, 3, 4, 5])==True
  assert element_exists(10, [1, 2, 3, 4, 5])==False
  assert element_exists(7, [7, 8, 9, 10])==True
  assert element_exists(0, [1, 2, 3, 4, 5])==False
  assert element_exists(1, [])==False
output: def element_exists(element, lst):
      return element in lst