Update status badge and add DOI badge

README.md

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-[![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: Active – The project has reached a stable, usable state and is being actively developed.](https://www.repostatus.org/badges/latest/active.svg)](https://www.repostatus.org/#active) [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.13354047.svg)](https://doi.org/10.5281/zenodo.13354047)
 
 This is the handbook for University of York Biology Department's [Cloud-SPAN](cloud-span.york.ac.uk) project. Read the book :sparkles: [here](https://cloud-span.github.io/CloudSPAN-handbook/) :sparkles:.