updated readme

Author: kunwuz

README.md

@@ -1,6 +1,6 @@
 # causal-learn: Causal Discovery in Python
 
-Causal-learn is a python package for causal discovery that implements both classical and state-of-the-art causal discovery algorithms, which is a Python translation and extension of [Tetrad](https://github.com/cmu-phil/tetrad).
+Causal-learn ([documentation](https://causal-learn.readthedocs.io/en/latest/), [paper](https://jmlr.org/papers/volume25/23-0970/23-0970.pdf)) is a python package for causal discovery that implements both classical and state-of-the-art causal discovery algorithms, which is a Python translation and extension of [Tetrad](https://github.com/cmu-phil/tetrad).
 
 The package is actively being developed. Feedbacks (issues, suggestions, etc.) are highly encouraged.