add mixbox for python

python/examples/npcv.py

@@ -0,0 +1,17 @@
+import cv2
+import numpy as np
+import mixbox
+
+height = 256
+width = 256
+img = np.zeros((height, width, 3), np.uint8)
+
+rgb1 = (0, 33, 133)  # blue
+rgb2 = (252, 211, 0) # yellow
+
+for x in range(0, 256):
+	for y in range(0, 256):
+		img[x, y] = mixbox.lerp(rgb1, rgb2, x / 255.0)
+
+cv2.imshow("image", cv2.cvtColor(img, cv2.COLOR_RGB2BGR))
+cv2.waitKey(0)