added CFF metadat family doi

Author: bgoli

CITATION.cff

@@ -22,6 +22,7 @@ title: "StochPy: A Comprehensive, User-Friendly Tool for Simulating Stochastic B
 version: "2.5"
 repository-code: "https://github.com/SystemsBioinformatics/stochpy"
 date-released: 2025-06-18
+doi: "10.5281/zenodo.5093784"
 license: "BSD-3-Clause"
 url: "https://github.com/SystemsBioinformatics/stochpy"
 abstract: "StochPy is a versatile stochastic modeling package which is designed for stochastic simulation of molecular control networks."