Update README.md

Author: davideFerigato

README.md

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 [![codecov](https://codecov.io/gh/davideFerigato/lumix/branch/main/graph/badge.svg)](https://codecov.io/gh/davideFerigato/lumix)
 [![Docker Pulls](https://img.shields.io/docker/pulls/davideferigato/lumix?cache=refresh)](https://hub.docker.com/r/davideferigato/lumix)
 [![Documentation](https://img.shields.io/badge/docs-mkdocs-blue.svg)](https://davideferigato.github.io/Lumix/)
+[![DOI](https://zenodo.org/badge/1030571578.svg)](https://doi.org/10.5281/zenodo.20709879)
 
 **Lumix** is a **modular**, **multilingual** command-line converter for physical units, digital data, time, security tools, and creative utilities.
 Designed to be **easily extensible**, it features **shell autocompletion** – all in one sleek package.