added a link to paper and supplementary material

README.md

@@ -94,6 +94,8 @@ This is the ***Easy set*** of our SRSD-Feynman datasets, which consists of the f
 | III.15.27 | \\(k = \frac{2 \pi}{N b} s\\) |
 
 
+More details of these datasets such as variables and sampling ranges are provided in [the paper and its supplementary material](https://openreview.net/forum?id=MPrcwjMgL3d).  
+
 ### Supported Tasks and Leaderboards
 
 Symbolic Regression