Added implementation of IRuntimeProvider for Windows

src/NzbDrone.Windows/DotNetRuntimeProvider.cs

@@ -0,0 +1,13 @@
+using System;
+using NzbDrone.Common.Processes;
+
+namespace NzbDrone.Windows
+{
+    public class DotNetRuntimeProvider : IRuntimeProvider
+    {
+        public String GetVersion()
+        {
+            return Environment.Version.ToString();
+        }
+    }
+}