add citation and update badge

README.md

@@ -4,8 +4,9 @@
 [![PyPI-Server](https://img.shields.io/pypi/v/matbench-genmetrics.svg)](https://pypi.org/project/matbench-genmetrics/)
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-![Lines of code](https://img.shields.io/tokei/lines/github/sparks-baird/matbench-genmetrics)
+[![DOI](https://joss.theoj.org/papers/10.21105/joss.05618/status.svg)](https://doi.org/10.21105/joss.05618)
 <!-- These are examples of badges you might also want to add to your README. Update the URLs accordingly.
+![Lines of code](https://img.shields.io/tokei/lines/github/sparks-baird/matbench-genmetrics)
 [![Built Status](https://api.cirrus-ci.com/github/<USER>/matbench-genmetrics.svg?branch=main)](https://cirrus-ci.com/github/<USER>/matbench-genmetrics)
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@@ -246,6 +247,14 @@ Then take a look into the `scripts` and `notebooks` folders.
 
 <!-- pyscaffold-notes -->
 
+## Citing
+
+Baird, S.G.; Sayeed, H.M.; Montoya, J.; Sparks, T.D. (2024). matbench-genmetrics: A Python library for benchmarking crystal structure generative models using time-based splits of Materials Project structures. _Journal of Open Source Software_, 9(97), 5618, https://doi.org/10.21105/joss.05618
+
+```bibtex
+@article{Baird2024, doi = {10.21105/joss.05618}, url = {https://doi.org/10.21105/joss.05618}, year = {2024}, publisher = {The Open Journal}, volume = {9}, number = {97}, pages = {5618}, author = {Sterling G. Baird and Hasan M. Sayeed and Joseph Montoya and Taylor D. Sparks}, title = {matbench-genmetrics: A Python library for benchmarking crystal structure generative models using time-based splits of Materials Project structures}, journal = {Journal of Open Source Software} }
+```
+
 ## Note
 
 This project has been set up using [PyScaffold] 4.2.2.post1.dev2+ge50b5e1 and the [dsproject extension] 0.7.2.post1.dev2+geb5d6b6.