readme: add DOI

JakaKokosar · Jan 26, 2023 · d7fc718 · d7fc718
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 # Single Sample GSEA analysis
 
+[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.7573200.svg)](https://doi.org/10.5281/zenodo.7573200)
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+10.5281/zenodo.7573200
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 Single-sample geneset enrichment analysis (ssGSEA) is a single-sample extension of the GSEA algorithm. It calculates a separate enrichment score for each sample and gene set pairing [[1]](#1).
 
 ## Install the latest version