Add xmldoc and serialisable attributes

osu.Game.Tournament/Models/LadderInfo.cs

@@ -1,12 +1,17 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using System;
 using System.Collections.Generic;
 using Newtonsoft.Json;
 using osu.Framework.Bindables;
 
 namespace osu.Game.Tournament.Models
 {
+    /// <summary>
+    /// Holds the complete data required to operate the tournament system.
+    /// </summary>
+    [Serializable]
     public class LadderInfo
     {
         public BindableList<TournamentMatch> Matches = new BindableList<TournamentMatch>();