add citation info in bibtex format

Author: jbytecode

README.md

@@ -54,6 +54,15 @@ This page includes both the API documentation and examples.
 - [2-player zero-sum game solver](https://jbytecode.github.io/OperationsResearchModels.jl/dev/game/)
 
 
+# How to cite
+
+Please use the citation info below if you use this package in your work.
+
+```bibtex
+@article{Satman2025, doi = {10.21105/joss.08592}, url = {https://doi.org/10.21105/joss.08592}, year = {2025}, publisher = {The Open Journal}, volume = {10}, number = {113}, pages = {8592}, author = {Satman, Mehmet Hakan}, title = {OperationsResearchModels.jl: A Julia package for operations research models}, journal = {Journal of Open Source Software} }
+```
+
+
 # How to contribute
 
 Please read the page [Contributing](https://github.com/jbytecode/OperationsResearchModels.jl/blob/main/CONTRIBUTING.md) before contributing.