Add Zenodo badge

Author: ufechner7

README.md

@@ -10,6 +10,7 @@ SPDX-License-Identifier: MPL-2.0
 [![CI](https://github.com/OpenSourceAWE/SymbolicAWEModels.jl/actions/workflows/CI.yml/badge.svg)](https://github.com/OpenSourceAWE/SymbolicAWEModels.jl/actions/workflows/CI.yml)
 [![Coverage](https://codecov.io/gh/OpenSourceAWE/SymbolicAWEModels.jl/branch/main/graph/badge.svg)](https://codecov.io/gh/OpenSourceAWE/SymbolicAWEModels.jl)
 [![Aqua QA](https://raw.githubusercontent.com/JuliaTesting/Aqua.jl/master/badge.svg)](https://github.com/JuliaTesting/Aqua.jl)
+[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.19092013.svg)](https://doi.org/10.5281/zenodo.19092013)
 
 ## Overview