docs: adding Zenodo badge to README (#466)

README.md

@@ -1,6 +1,7 @@
 [![CI](https://github.com/bihealth/reev/actions/workflows/main.yml/badge.svg)](https://github.com/bihealth/reev/actions/workflows/main.yml)
 [![codecov](https://codecov.io/gh/bihealth/reev/branch/main/graph/badge.svg?token=Y4wbU8RTD8)](https://codecov.io/gh/bihealth/reev)
 [![Documentation Status](https://readthedocs.org/projects/reev/badge/?version=latest)](https://reev.readthedocs.io/en/latest/?badge=latest)
+[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.10436129.svg)](https://doi.org/10.5281/zenodo.10436129)
 
 # REEV