Add MqttDefaultJsonOptions.cs

Author: seikosantana

Source/Routing/MqttDefaultJsonOptions.cs

@@ -0,0 +1,13 @@
+using System.Text.Json;
+
+namespace MQTTnet.AspNetCore.Routing;
+
+public class MqttDefaultJsonOptions
+{
+    public JsonSerializerOptions SerializerOptions { get; }
+
+    public MqttDefaultJsonOptions(JsonSerializerOptions options)
+    {
+        SerializerOptions = options;
+    }
+}