Add Zenodo badge to README.md

README.md

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 # OPTIMETA Geo Plugin
 
-[![Project Status: WIP – Initial development is in progress, but there has not yet been a stable, usable release suitable for the public.](https://www.repostatus.org/badges/latest/wip.svg)](https://www.repostatus.org/#wip)
+[![Project Status: WIP – Initial development is in progress, but there has not yet been a stable, usable release suitable for the public.](https://www.repostatus.org/badges/latest/wip.svg)](https://www.repostatus.org/#wip) [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.8198983.svg)](https://doi.org/10.5281/zenodo.8198983)
 
 The OPTIMETA Geo Plugin offers a novel way to capture and provide geospatial properties of research articles in [Open Journal Systems](https://pkp.sfu.ca/ojs/) (OJS).
 It is developed as part of the BMBF-funded project [OPTIMETA](https://projects.tib.eu/optimeta/en/).