Create a function called are_circles_overlapping(circle_1_x,
  circle_1_y, circle_1_radius, circle_2_x, circle_2_y,
  circle_2_radius) in a file called circle_overlap.py.
  The function should return True if the circle centered
  at (circle_1_x, circle_1_y) with a radius
  of circle_1_radius is overlapping with the circle centered
  at (circle_2_x, circle_2_y) with a radius
  of circle_2_radius.  The function should
  return False otherwise.  Consider two circle touching
  to be not overlapping.
You can compute whether two circles are overlapping by determining if the center points of the circles are within the sum of the circle radii.