input: Write a python function to create a Point class that can determine if a point is at the origin.
  assert Point(0, 0).is_origin() == True
  assert Point(1, 1).is_origin() == False
  assert Point(-1, 0).is_origin() == False
output: def Point:
      def __init__(self, x, y):
          self.x = x
          self.y = y
      
      def is_origin(self):
          return self.x == 0 and self.y == 0