input: Write a function to search for an item in a list of strings.
  assert search_for_item(['apple', 'banana', 'cherry'], 'banana') == True
  assert search_for_item(['apple', 'banana', 'cherry'], 'grape') == False
  assert search_for_item([], 'banana') == False
output: def search_for_item(lst, item):
      return item in lst