Add RSS Categories for dlvr.it Auto-hashtagging

#Redstone, #Threshold, #Threshold2

#HashtagMoreHashtags

BuildFeed/Controllers/rssController.cs

@@ -80,6 +80,7 @@ namespace BuildFeed.Controllers
                               IsPermaLink = true,
                               Value = $"{Request.Url.Scheme}://{Request.Url.Authority}{Url.Action("viewBuild", new { controller = "front", id = build.Id })}"
                            },
+                           Category = GetCategoryForBuild(build),
                            InternalPubDate = new RssDate(build.Added).DateStringISO8601 // bit of a dirty hack to work around problem in X.Web.RSS with the date format.
                         }).ToList()
             }
@@ -243,5 +244,23 @@ namespace BuildFeed.Controllers
 
          return new EmptyResult();
       }
+
+      private static RssCategory GetCategoryForBuild(BuildModel b)
+      {
+         if(b.Number >= 11000)
+         {
+            return new RssCategory() { Text = "Redstone" };
+         }
+         else if(b.Number >= 10500)
+         {
+            return new RssCategory() { Text = "Threshold2" };
+         }
+         else if (b.Number >= 9700)
+         {
+            return new RssCategory() { Text = "Threshold" };
+         }
+
+         return null;
+      }
    }
 }