input: Write a function to create a dictionary with numbers as keys and their squares as values.
  assert create_dict_with_squares([1, 2, 3, 4, 5]) == {1: 1, 2: 4, 3: 9, 4: 16, 5: 25}
  assert create_dict_with_squares([6, 7, 8, 9, 10]) == {6: 36, 7: 49, 8: 64, 9: 81, 10: 100}
  assert create_dict_with_squares([0, 11, 12]) == {0: 0, 11: 121, 12: 144}
output: def create_dict_with_squares(numbers):
      return {num: num**2 for num in numbers}