Add ArXiv link to journal version in README

Author: sourav2609

README.md

@@ -23,7 +23,7 @@ The code is citable using the following DOI:
 ## Journal Version
 **Title**: *Dynamic FDD for Spectrum Sharing in Non-Terrestrial Networks* <br>
 **Authors**: *Sourav Mukherjee, Bho Matthiesen, Armin Dekorsy, Petar Popovski* <br>
-**ArXiv**: 
+**ArXiv**: *https://arxiv.org/abs/2606.04849*
 
 ## Conference Version
 **Title**: *Dynamic Downlink-Uplink Spectrum Sharing in Non-Terrestrial Networks*<br>