Merge proces, enable signing of the assembly.

Frameworks/MQTTnet.NetStandard/Server/GetOrCreateClientSessionResult.cs

@@ -0,0 +1,9 @@
+namespace MQTTnet.Server
+{
+    public sealed class GetOrCreateClientSessionResult
+    {
+        public bool IsExistingSession { get; set; }
+
+        public MqttClientSession Session { get; set; }
+    }
+}