docs: add link to Zenodo

cheminfo · Nov 12, 2022 · 67907eb · 67907eb
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 [![NPM version][npm-image]][npm-url]
 [![build status][ci-image]][ci-url]
 [![npm download][download-image]][download-url]
+[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.5172776.svg)](https://doi.org/10.5281/zenodo.5172776)
 
 Generates a spectrum from discrete peaks. The shape of the peaks can be customized.