Add citation details

CITATION.bib

@@ -0,0 +1,12 @@
+@article{Kwon2024,
+ doi = {10.21105/joss.06875},
+ url = {https://doi.org/10.21105/joss.06875},
+ year = {2024},
+ publisher = {The Open Journal},
+ volume = {9},
+ number = {100},
+ pages = {6875},
+ author = {Sun Yong Kwon and Eric Thibodeau and Alex Plotkowski and Ying Yang},
+ title = {Equilipy: a python package for calculating phase equilibria},
+ journal = {Journal of Open Source Software}
+}

README.md

@@ -26,6 +26,12 @@ The following features are currently available.
 
 For details, check out the example directory and [Features and Examples](https://ornl.github.io/Equilipy/features.html)
 
+## Citing Equilipy
+
+If you use Equilipy in your work, please cite the following [paper](CITATION.bib).
+In addition, cite the current release or version used from
+[Zenodo](https://zenodo.org/doi/10.5281/zenodo.13157231).
+
 ## Contributing
 We encourage you to contribute to Equilipy. Please see [contributing guidelines](CONTRIBUTING.md).