Update README.md

README.md

@@ -105,7 +105,7 @@ configs:
 - **Homepage:** http://yann.lecun.com/exdb/mnist/
 - **Repository:** None
 - **Paper:** None
-- **Leaderboard:** None
+- **Leaderboard:** [Papers with Code](https://paperswithcode.com/dataset/imagenet)
 - **Point of Contact:** None
 
 ### Dataset Summary