WIP

First draft for MQTTnetServer project
* Basic support for settings
* Nasty code for setting up kestrel from appsettings.json

Source/MQTTnetServer/appsettings.Development.json

@@ -0,0 +1,9 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Debug",
+      "System": "Information",
+      "Microsoft": "Information"
+    }
+  }
+}