README.md: Add DOI and citation guide

Signed-off-by: Boxuan Li <[email protected]>

README.md

@@ -14,6 +14,7 @@ can support thousands of concurrent users, complex traversals, and analytic grap
 [![Mentioned in Awesome Bigtable][awesome-shield]][awesome-link]
 [![CII Best Practices][bestpractices-shield]][bestpractices-link]
 [![Codacy Badge][codacy-shield]][codacy-link]
+[![DOI][doi-shield]][doi-link]
 
 [actions-shield]: https://img.shields.io/github/actions/workflow/status/JanusGraph/janusgraph/ci-core.yml?branch=master
 [actions-link]: https://github.com/JanusGraph/janusgraph/actions
@@ -33,6 +34,8 @@ can support thousands of concurrent users, complex traversals, and analytic grap
 [codecov-link]:https://codecov.io/gh/JanusGraph/janusgraph
 [docker-pulls-img]: https://img.shields.io/docker/pulls/janusgraph/janusgraph.svg
 [docker-hub-url]: https://hub.docker.com/r/janusgraph/janusgraph
+[doi-shield]: https://zenodo.org/badge/DOI/10.5281/zenodo.14807604.svg
+[doi-link]: https://doi.org/10.5281/zenodo.14807604
 
 ## Learn More
 
@@ -142,3 +145,18 @@ The following users have deployed JanusGraph in production.
 * [Red Hat](https://www.redhat.com/) - [application migration and assessment tool](https://developers.redhat.com/products/rhamt/overview/) built on [Windup](https://github.com/windup/windup)
 * [Times Internet](https://timesinternet.in)
 * [Uber](https://uber.com)
+
+## Cite
+
+If you use JanusGraph in your research, please cite it using this metadata:
+
+```
+@software{janusgraph_2024,
+    title = {JanusGraph: an open-source, distributed graph database},
+    author = {{JanusGraph Contributors}},
+    year = {2024},
+    version = {1.1.0},
+    publisher = {Zenodo},
+    doi = {10.5281/zenodo.14807604}
+}
+```