Added static attributes to Dota 2 schema

Author: Justin

src/Steam.Models/DOTA2/SchemaItemModel.cs

@@ -40,5 +40,7 @@ public class SchemaItemModel
         public IList<string> UsedByHeroes { get; set; }
 
         public IList<string> BundledItems { get; set; }
+
+        public IList<SchemaItemStaticAttributeModel> StaticAttributes { get; set; }
     }
 }

src/Steam.Models/DOTA2/SchemaItemStaticAttributeModel.cs

@@ -0,0 +1,8 @@
+namespace Steam.Models.DOTA2
+{
+    public class SchemaItemStaticAttributeModel
+    {
+        public string Class { get; set; }
+        public string Value { get; set; }
+    }
+}