input: Write a python function to check if an element exists in a list.
  assert find_elm([1, 2, 3, 4, 5], 3) == True
  assert find_elm([10, 20, 30, 40, 50], 25) == False
  assert find_elm(['apple', 'banana', 'cherry'], 'banana') == True
  assert find_elm(['dog', 'cat', 'mouse'], 'elephant') == False
output: def find_elm(lst, elm):
      return elm in lst