Refactor .NET Standard projects

Frameworks/MQTTnet.NetStandard/MqttServerFactory.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using MQTTnet.Core.Adapter;
+using MQTTnet.Core.Server;
+using MQTTnet.Implementations;
+
+namespace MQTTnet
+{
+    public class MqttServerFactory
+    {
+        public MqttServer CreateMqttServer(MqttServerOptions options)
+        {
+            if (options == null) throw new ArgumentNullException(nameof(options));
+
+            return new MqttServer(options, new List<IMqttServerAdapter> { new MqttServerAdapter() });
+        }
+    }
+}