Link dataset to paper

This PR ensures people can find your dataset at https://huggingface.co/papers/2409.18433.

README.md

@@ -328,7 +328,7 @@ configs:
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 ## Dataset Description
-[Easy2Hard-Bench](https://arxiv.org/abs) is a benchmark consisting with 6 datasets in different domain (mathematics, programming, chess, and various reasoning tasks). The problems from each dataset are labeled with continuous-valued difficulty levels.
+[Easy2Hard-Bench](https://huggingface.co/papers/2409.18433) is a benchmark consisting with 6 datasets in different domain (mathematics, programming, chess, and various reasoning tasks). The problems from each dataset are labeled with continuous-valued difficulty levels.
 
 |                | Topic                   | Source          | Statistics Used to Infer Difficulty                                          | Source Type | Estimation Method |
 |----------------|-------------------------|-----------------|------------------------------------------------------------------------------|-------------|-------------------|