Update README.md

README.md

@@ -1,5 +1,6 @@
 ## **The `data-suicide-psyctr` dataset** 📊 
 
+[<img src="https://img.shields.io/badge/DOI-10.5281%2Fzenodo.8364508-blue">](https://doi.org/10.5281/zenodo.8364508) 
 
 The `data-suicide-psyctr` dataset is a meta-analytic research domain [MARD](https://docs.metapsy.org/uploads/ebmental-2022-300509.pdf)) on psychotherapy for suicidal ideation and suicide attempts. This MARD is part of the  [Metapsy project](https://www.metapsy.org/). The dataset contains study information and effect size data of trials that report the effect of psychotherapy on suicidal ideation, suicide attempts (including self-harm leading to hospitalisation) or completed suicides. This dataset includes psychotherapy vs. control ('psy vs ctr') comparisons. Effect sizes are provided for outcomes at post-test. Suicidal ideation and suicide attempts are different outcomes and are analysed separately.