Added User authentication

MediaBrowser.Model/DTO/AuthenticationResult.cs

@@ -0,0 +1,12 @@
+using System;
+using ProtoBuf;
+
+namespace MediaBrowser.Model.DTO
+{
+    [ProtoContract]
+    public class AuthenticationResult
+    {
+        [ProtoMember(1)]
+        public bool Success { get; set; }
+    }
+}

MediaBrowser.Model/DTO/DTOUser.cs

@@ -14,5 +14,8 @@ namespace MediaBrowser.Model.DTO
 
         [ProtoMember(3)]
         public bool HasImage { get; set; }
+
+        [ProtoMember(4)]
+        public bool HasPassword { get; set; }
     }
 }