add DOI to README.md

rreichel86 · Feb 21, 2023 · 6d73395 · 6d73395
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 # A Quadtree based finite element mesh generator to discretize two-dimensional heterogeneous solids
 
 [![License: MIT](https://img.shields.io/badge/License-MIT-success.svg)](https://opensource.org/licenses/MIT)
+[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.7661707.svg)](https://doi.org/10.5281/zenodo.7661707)
 
 The two-dimensional heterogeneous solid is given by its outer boundary
 and material interfaces. These are later modeled by simple closed polygonal