Add aura new features in changelog

Co-authored-by: Florentin Dörre <florentin.dorre@neo4j.com>

Author: brs96

changelog.md

@@ -6,6 +6,9 @@
 
 ## New features
 
+* Add the new concept of GDS Sessions, used to manage GDS computations in Aura, based on data from an AuraDB instance.
+  * Add a new `gds.graph.project` endpoint to project graphs from AuraDB instances to GDS sessions.
+
 
 ## Bug fixes