Add DOI

Author: JelmerBot

README.md

@@ -1,6 +1,6 @@
 [![PyPI version](https://badge.fury.io/py/multi-mst.svg)](https://badge.fury.io/py/multi-mst)
 [![Tests](https://github.com/vda-lab/multi_mst/actions/workflows/Tests.yml/badge.svg?branch=main)](https://github.com/vda-lab/multi_mst/actions/workflows/Tests.yml)
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+[![DOI](https://zenodo.org/badge/782003801.svg)](https://doi.org/10.5281/zenodo.13929036)
 
 Manifold Modelling with Minimum Spanning Trees
 ==============================================
@@ -179,4 +179,4 @@ LICENSE file for details.
 
 
 [1]: <https://onlinelibrary.wiley.com/doi/10.1002/asi.20904> "Pathfinder Networks"
-[2]: <https://ieeexplore.ieee.org/document/8231853> "GraphRay"
+[2]: <https://ieeexplore.ieee.org/document/8231853> "GraphRay"