added schema generation

NzbDrone.Api/ClientSchema/FieldDefinitionAttribute.cs

@@ -0,0 +1,18 @@
+using System;
+
+namespace NzbDrone.Api.ClientSchema
+{
+    [AttributeUsage(AttributeTargets.Property, AllowMultiple = false)]
+    public class FieldDefinitionAttribute : Attribute
+    {
+
+        public FieldDefinitionAttribute(int order)
+        {
+            Order = order;
+        }
+
+        public int Order { get; private set; }
+        public string Label { get; set; }
+        public string HelpText { get; set; }
+    }
+}