first working version of zugferd rest service

WEBSERVICES/ZUGFeRDRESTService/Logger.cs

@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace ZUGFeRDRESTService
+{
+    public sealed class Logger
+    {
+        private static readonly Lazy<Logger> lazy = new Lazy<Logger>(() => new Logger());
+
+        public static Logger Instance { get { return lazy.Value; } }
+
+        private Logger()
+        {
+
+        }
+    }
+}
+