added visualization codes

Author: Depu Meng (FA Talent)

README.md

@@ -233,7 +233,7 @@ python visualize/plot_mpii.py --prediction [your/prediction/path.mat]
 ```
 
 
-<img src="figures\visualization\coco\score_610_id_2685_000000002685.png" height="200"><img src="figures\visualization\coco\score_710_id_153229_000000153229.png" height="200"><img src="figures\visualization\coco\score_755_id_343561_000000343561.png" height="200">
+<img src="figures\visualization\coco\score_610_id_2685_000000002685.png" width="*"><img src="figures\visualization\coco\score_710_id_153229_000000153229.png" height="*"><img src="figures\visualization\coco\score_755_id_343561_000000343561.png" height="*">
 
 <img src="figures\visualization\mpii\id_0.png" height="165.5"><img src="figures\visualization\mpii\id_54.png" height="165.5"><img src="figures\visualization\mpii\id_566.png" height="165.5">