Update citation info and add zenodo doi

CITATION.cff

@@ -38,7 +38,7 @@ preferred-citation:
       given-names: "Stefan"
       orcid: "https://orcid.org/0000-0001-9987-4733"
   doi: "10.3389/fmats.2022.825043"
-  journal: "npj Computational Materials"
+  journal: "Front. Mater."
   month: 2
   title: "The AiiDA-Spirit Plugin for Automated Spin-Dynamics Simulations and Multi-Scale Modeling Based on First-Principles Calculations"
   volume: 9

README.md

@@ -2,6 +2,7 @@
 [![Coverage Status](https://codecov.io/gh/JuDFTteam/aiida-spirit/branch/main/graph/badge.svg?token=F7ISM4558S)](https://codecov.io/gh/JuDFTteam/aiida-spirit)
 [![Docs status](https://readthedocs.org/projects/aiida-spirit/badge)](http://aiida-spirit.readthedocs.io/)
 [![PyPI version](https://badge.fury.io/py/aiida-spirit.svg)](https://badge.fury.io/py/aiida-spirit)
+[![DOI](https://zenodo.org/badge/364820045.svg)](https://zenodo.org/badge/latestdoi/364820045)
 
 # aiida-spirit
 
@@ -49,6 +50,14 @@ PATH="/Applications/Postgres.app/Contents/Versions/9.6/bin/:$PATH"
 export PATH
 ```
 
+## Citation
+
+If you use AiiDA-Spirit please cite the method paper
+ - P. Rüßmann, J. Ribas Sobreviela, M. Sallermann, M. Hoffmann, F. Rhiem, and S. Blügel, *The AiiDA-Spirit Plugin for Automated Spin-Dynamics Simulations and Multi-Scale Modeling Based on First-Principles Calculations*, Front. Mater. **9**, 825043 (2022). [doi: 10.3389/fmats.2022.825043](https://doi.org/10.3389/fmats.2022.825043),
+
+ and the latest code release
+ - P. Rüßmann, J. Ribas Sobreviela, M. Sallermann, M. Hoffmann, F. Rhiem, and S. Blügel. JuDFTteam/aiida-spirit. Zenodo. [doi: 10.5281/zenodo.8070770](https://doi.org/10.5281/zenodo.8070770).
+
 ## License
 
 The AiiDA-Spirit code is under the [MIT license](LICENSE).