add doi

Author: pmbittner

README.md

@@ -5,6 +5,7 @@
 [![Install](https://img.shields.io/badge/Install-Instructions-blue)](INSTALL.md)
 [![GitHubPages](https://img.shields.io/badge/GitHub%20Pages-online-blue.svg?style=flat)][website]
 [![License](https://img.shields.io/badge/License-GNU%20LGPLv3-blue)](LICENSE.LGPL3)
+[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.6818140.svg)](https://doi.org/10.5281/zenodo.6818140)
 
 This is the replication package for our paper _Classifying Edits to Variability in Source Code_ accepted at the 30th ACM Joint European Software Engineering Conference and Symposium on the Foundations of Software Engineering (ESEC/FSE 2022).
 

STATUS.md

@@ -39,7 +39,7 @@ We claim the _Artifacts Evaluated Reusable_ badge as we implemented DiffDetectiv
 Furthermore, both DiffDetective and our Haskell formalization serve as reference implementations if researchers or practitioners want to reimplement our theory in other programming languages.
 
 [ddgithub]: https://github.com/VariantSync/DiffDetective/tree/esecfse22
-[ddzenodo]: UNDEFINED
+[ddzenodo]: https://doi.org/10.5281/zenodo.6818140
 [ddreadme]: https://github.com/VariantSync/DiffDetective/tree/esecfse22/README.md
 [ddappendix]: https://github.com/VariantSync/DiffDetective/raw/esecfse22/appendix.pdf
 [ddproofs]: https://github.com/VariantSync/DiffDetective/tree/esecfse22/proofs