Prepare release-note for Xdstar Client

XDStar-Client/release-note.md

 ---
 title: Release note
 subtitle: XDStarClient
-toolversion: 2.5.13
-releasedate: 2023-07-04
+toolversion: 2.6.0
+releasedate: 2023-12-01
 author: Anne-Gaëlle BERGE
 function: Software Engineer
 customer: IHE Europe
 reference: KER1-RNO-IHE-XDSTARCLIENT
 ---
+# 2.6.0
+_Release date: 2023-12-01_
+
+__Task__
+* \[[XDSTAR-770](https://gazelle.ihe.net/jira/browse/XDSTAR-770)\] Integrate new sso-client-v7
+
 # 2.5.14
 _Release date: 2023-07-04_