input: Write a python function to create a frequency dictionary from a list of strings.
  assert get_freq_dict(["hello", "world", "hello", "goodbye"]) == {'hello': 2, 'world': 1, 'goodbye': 1}
  assert get_freq_dict(["test", "test", "test"]) == {'test': 3}
  assert get_freq_dict(["one", "two", "three", "one", "two", "one"]) == {'one': 3, 'two': 2, 'three': 1}
output: def get_freq_dict(lst):
      freq_dict = {}
      for item in lst:
          if item in freq_dict:
              freq_dict[item] += 1
          else:
              freq_dict[item] = 1
      return freq_dict