Added reference project

ref/Net/Rest/CompletedRequestEventArgs.cs

@@ -0,0 +1,17 @@
+namespace Discord.Net.Rest
+{
+    public class CompletedRequestEventArgs : RequestEventArgs
+    {
+        public object Response { get; set; }
+        public string ResponseJson { get; set; }
+        public double Milliseconds { get; set; }
+
+        public CompletedRequestEventArgs(IRestRequest request, object response, string responseJson, double milliseconds)
+            : base(request)
+        {
+            Response = response;
+            ResponseJson = responseJson;
+            Milliseconds = milliseconds;
+        }
+    }
+}