first commit

Data/Song/Song.cs

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+using System;
+using System.Collections.Generic;
+using Avalonia.Media;
+
+namespace MercuryConverter.Data;
+
+public class Song
+{
+    /// <summary>
+    /// Format: `Snn-nnn` where `n` is a digit.
+    /// </summary>
+    public required string id;
+    public required string name;
+    public required string rubi;
+    public required string artist;
+    public required string copyright;
+    public required string tempo;
+    public required string version;
+    public required int genreId;
+    public required string game;
+    public required string jacket;
+    public Chart?[] charts = { null, null, null, null };
+}