Add Discord GameSDK.

Assets/Plugins/DiscordGameSDK/LobbyManager.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Runtime.InteropServices;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Discord
+{
+    public partial class LobbyManager
+    {
+        public IEnumerable<User> GetMemberUsers(Int64 lobbyID)
+        {
+            var memberCount = MemberCount(lobbyID);
+            var members = new List<User>();
+            for (var i = 0; i < memberCount; i++)
+            {
+                members.Add(GetMemberUser(lobbyID, GetMemberUserId(lobbyID, i)));
+            }
+            return members;
+        }
+
+        public void SendLobbyMessage(Int64 lobbyID, string data, SendLobbyMessageHandler handler)
+        {
+            SendLobbyMessage(lobbyID, Encoding.UTF8.GetBytes(data), handler);
+        }
+    }
+}