Update whats-new.adoc

docs/modules/ROOT/pages/whats-new.adoc

@@ -32,7 +32,7 @@ image:ROOT:client-routing.png[Hazelcast Cluster Routing diagram]
 
 For more information, see xref:clients:java.adoc#client-cluster-routing-modes[Client cluster routing modes].
 
-== New Hazelcast Cluster Manager for Vert.x
+== New Hazelcast Cluster Manager for Vert.x version 5
 [.enterprise]*Enterprise* 
 
 Vert.x is a reactive application toolkit for creating resource-efficient, concurrent, asynchronous and flexible applications on the JVM. The new `vertx-hazelcast-enterprise` module available for Hazelcast Platform 5.5 offers advanced features like strong consistency and enhanced fault tolerance. This integration reduces complexity, abstracts low-level management tasks, and ensures optimal resource efficiency, making it ideal for dynamic environments requiring high availability and minimal downtime. The open-source `vertx-hazelcast` module is still available directly from https://vertx.io/docs/vertx-hazelcast/java/[Vert.x] but does not support strong consistency.
@@ -84,3 +84,11 @@ Support added for CPMap data structures, including `cpmap` commands and advanced
 For detailed release notes that include new features and fixes, see xref:clc:ROOT:release-notes-5.4.1.adoc[Hazelcast CLC 5.4.1].
 
 To get started with Hazelcast CLC, see xref:clc:ROOT:install-clc.adoc[Installing the Hazelcast CLC].
+
+== Hazelcast .NET Client
+
+Support added for MultiMember routing mode, and CP requests redirected to CP leaders.
+
+For detailed release notes that include new features and fixes, see https://github.com/hazelcast/hazelcast-csharp-client/releases/tag/v5.5.0[Hazelcast .NET 5.5.0].
+
+To get started with Hazelcast .NET Client, see https://hazelcast.github.io/hazelcast-csharp-client/latest/doc/download-install.html[Hazelcast .NET documentation].