chore: update README.md with new JOSS publication/

I have added the DOI and GitHub badge of the new paper.

Author: Panadestein

README.md

@@ -4,6 +4,7 @@
 
 # GreenX Library 
 [![DOI](https://joss.theoj.org/papers/10.21105/joss.05570/status.svg)](https://doi.org/10.21105/joss.05570)
+[![DOI](https://joss.theoj.org/papers/10.21105/joss.07859/status.svg)](https://doi.org/10.21105/joss.07859)
 
 The Green X library is developed under Work Package 2 of the NOMAD Center of Excellence. 
 It is available under the APACHE2 [license](LICENSE.txt).
@@ -246,4 +247,4 @@ For more information and benchmark examples see also the [GreenX website](https:
 
 ## Contribute
 
-Contributions to GreenX are highly appreciated! If you consider contributing [check out CONTRIBUTING.md](https://github.com/nomad-coe/greenX/blob/main/CONTRIBUTING.md).
+Contributions to GreenX are highly appreciated! If you consider contributing [check out CONTRIBUTING.md](https://github.com/nomad-coe/greenX/blob/main/CONTRIBUTING.md).