Added Ramer–Douglas–Peucker algo for contour approximation

src/pyhexspline/spline_volume.py

@@ -199,6 +199,7 @@ def draw_contours(self, img, loc=str("outer"), approximation: bool = True):
         Args:
             img (numpy.ndarray): The input image as a 2D numpy array.
             loc (str): The location of the contour. Can be "outer" or "inner". Defaults to "outer".
+            approximation (bool): If True, contour is approximated using the Ramer-Douglas-Peucker (RDP) algorithm. Defaults to True.
 
         Returns:
             numpy.ndarray: The contour image as a 2D numpy array.