add zenodo doi

README.md

@@ -1,6 +1,7 @@
 # LaMEM.jl
 [![Build Status](https://github.com/JuliaGeodynamics/LaMEM.jl/workflows/CI/badge.svg)](https://github.com/JuliaGeodynamics/LaMEM.jl/actions)
 [![Dev](https://img.shields.io/badge/docs-dev-blue.svg)](https://juliageodynamics.github.io/LaMEM.jl/dev/)
+[![DOI](https://zenodo.org/badge/531427568.svg)](https://zenodo.org/doi/10.5281/zenodo.10211627)
 
 This is the Julia interface to [LaMEM](https://github.com/UniMainzGeo/LaMEM/)) (Lithosphere and Mantle Evolution Model), which is the easiest way to install LaMEM on any system. It allows you to start a (parallel) LaMEM simulation, and read back the output files to julia for further processing.