Add .NET Core 2.1 versions

result/dotnet/Result/Hubs/ResultsHub.cs

@@ -0,0 +1,14 @@
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.SignalR;
+using Result.Models;
+
+namespace Result.Hubs
+{
+    public class ResultsHub : Hub
+    {
+        public async Task UpdateResults(ResultsModel results)
+        {
+            await Clients.All.SendAsync("UpdateResults", results);
+        }
+    }
+}