input: Write a function to create a nested dictionary from two lists of keys and values.
  assert create_nested_dict(['a', 'b', 'c'], [1, 2, 3]) == {'a': 1, 'b': 2, 'c': 3}
  assert create_nested_dict(['x', 'y', 'z'], [10, 20, 30]) == {'x': 10, 'y': 20, 'z': 30}
  assert create_nested_dict(['key1', 'key2'], [100, 200]) == {'key1': 100, 'key2': 200}
output: def create_nested_dict(keys, values):
      return {k: v for k, v in zip(keys, values)}