add environment info

MediaBrowser.Model/System/IEnvironmentInfo.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace MediaBrowser.Model.System
+{
+    public interface IEnvironmentInfo
+    {
+        MediaBrowser.Model.System.OperatingSystem OperatingSystem { get; }
+        string OperatingSystemName { get; }
+        string OperatingSystemVersion { get; }
+    }
+
+    public enum OperatingSystem
+    {
+        Windows,
+        Linux,
+        OSX
+    }
+}