adding shuffle

Kasbot.APP/Extensions/IListExtensions.cs

@@ -0,0 +1,21 @@
+using Discord.WebSocket;
+
+namespace Kasbot.Extensions
+{
+    public static class IListExtensions
+    {
+        public static IEnumerable<T> Shuffle<T>(this IEnumerable<T> source)
+        {
+            var rng = new Random();
+
+            var buffer = source.ToList();
+            for (int i = 0; i < buffer.Count; i++)
+            {
+                int j = rng.Next(i, buffer.Count);
+                yield return buffer[j];
+
+                buffer[j] = buffer[i];
+            }
+        }
+    }
+}