input: Write a python function to create a dictionary with numbers as keys and their squares as values.
  assert create_numbers_dictionary(5) == {1: 1, 2: 4, 3: 9, 4: 16, 5: 25}
  assert create_numbers_dictionary(3) == {1: 1, 2: 4, 3: 9}
  assert create_numbers_dictionary(0) == {}
output: def create_numbers_dictionary(n):
      return {i: i**2 for i in range(1, n+1)}