Add ruleset templates structure

Templates/Rulesets/ruleset-example/osu.Game.Rulesets.Pippidon/Beatmaps/PippidonBeatmapConverter.cs

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+// 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.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Objects.Types;
+using osu.Game.Rulesets.Pippidon.Objects;
+using osuTK;
+
+namespace osu.Game.Rulesets.Pippidon.Beatmaps
+{
+    public class PippidonBeatmapConverter : BeatmapConverter<PippidonHitObject>
+    {
+        public PippidonBeatmapConverter(IBeatmap beatmap, Ruleset ruleset)
+            : base(beatmap, ruleset)
+        {
+        }
+
+        public override bool CanConvert() => Beatmap.HitObjects.All(h => h is IHasPosition);
+
+        protected override IEnumerable<PippidonHitObject> ConvertHitObject(HitObject original, IBeatmap beatmap, CancellationToken cancellationToken)
+        {
+            yield return new PippidonHitObject
+            {
+                Samples = original.Samples,
+                StartTime = original.StartTime,
+                Position = (original as IHasPosition)?.Position ?? Vector2.Zero,
+            };
+        }
+    }
+}