docs: add zenodo badge

yoshoku · Jan 3, 2025 · bc5ce6c · bc5ce6c
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 [![Gem Version](https://badge.fury.io/rb/rumale.svg)](https://badge.fury.io/rb/rumale)
 [![BSD 3-Clause License](https://img.shields.io/badge/License-BSD%203--Clause-orange.svg)](https://github.com/yoshoku/rumale/blob/main/LICENSE.txt)
 [![Documentation](https://img.shields.io/badge/api-reference-blue.svg)](https://yoshoku.github.io/rumale/doc/)
+[![DOI](https://zenodo.org/badge/105371532.svg)](https://doi.org/10.5281/zenodo.14590520)
 
 Rumale (**Ru**by **ma**chine **le**arning) is a machine learning library in Ruby.
 Rumale provides machine learning algorithms with interfaces similar to Scikit-Learn in Python.