Add .NET Core 2.1 versions

result/dotnet/Result/Models/ResultsModel.cs

@@ -0,0 +1,15 @@
+namespace Result.Models
+{
+    public class ResultsModel
+    {
+        public int OptionA { get; set; }
+
+        public int OptionB { get; set; }
+
+        public int VoteCount { get; set; }
+
+        public double OptionAPercent { get; set; }
+
+        public double OptionBPercent { get; set; }
+    }
+}