README: update video links

Author: redchenjs

README.md

@@ -65,5 +65,5 @@ idf.py flash monitor
 
 ## Videos Links
 
-* [智慧校园NFC考勤系统简介](https://www.bilibili.com/video/av64088862)
-* [智慧校园NFC考勤系统配套微信小程序](https://www.bilibili.com/video/av83055533)
+* [智慧校园NFC考勤系统简介](https://www.bilibili.com/video/av64088862) ([YouTube](https://www.youtube.com/watch?v=l8kSf4VVHyo))
+* [智慧校园NFC考勤系统配套微信小程序](https://www.bilibili.com/video/av83055533) ([YouTube](https://www.youtube.com/watch?v=4vxJgOV0nS0))