Added initial models.

Harmonia.Core/Models/GroupOption.cs

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+namespace Harmonia.Core.Models;
+
+public class GroupOption(string fieldName)
+{
+    public string FieldName { get; init; } = fieldName;
+}

Harmonia.Core/Models/Playlist.cs

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+namespace Harmonia.Core.Models;
+
+public class Playlist(string name)
+{
+    public string UID { get; set; } = Guid.NewGuid().ToString();
+    public string Name { get; set; } = name;
+    public List<PlaylistSong> Songs { get; set; } = [];
+    public List<GroupOption> GroupOptions { get; set; } = [];
+    public List<SortOption> SortOptions { get; set; } = [];
+    public bool IsLocked { get; set; }
+}

Harmonia.Core/Models/PlaylistSong.cs

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+namespace Harmonia.Core.Models;
+
+public class PlaylistSong(Song song)
+{
+    public string UID { get; } = Guid.NewGuid().ToString();
+    public Song Song { get; } = song;
+}

Harmonia.Core/Models/Song.cs

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+namespace Harmonia.Core.Models;
+
+public class Song
+{
+    public required string FileName { get; set; }
+    public ulong Size { get; set; }
+    public DateTime? LastModified { get; set; }
+    public string? Title { get; set; }
+    public string? Album { get; set; }
+    public string? ImageName { get; set; }
+    public string? ImageHash { get; set; }
+    public List<string> Artists { get; set; } = [];
+    public List<string> AlbumArtists { get; set; } = [];
+    public byte? TrackNumber { get; set; }
+    public byte? DiscNumber { get; set; }
+    public TimeSpan Length { get; set; }
+    public ushort? Year { get; set; }
+    public string? Genre { get; set; }
+    public uint BitRate { get; set; }
+    public uint SampleRate { get; set; }
+
+    public string? FilePath => Path.GetDirectoryName(FileName);
+    public string? FileDirectory => Directory.GetParent(FileName)?.Name;
+    public string? FileType => Path.GetExtension(FileName)?.Replace(".", "").ToUpper();
+    public string ShortFileName => Path.GetFileNameWithoutExtension(FileName);
+}

Harmonia.Core/Models/SortOption.cs

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+using System.ComponentModel;
+
+namespace Harmonia.Core.Models;
+
+public class SortOption(string fieldName, ListSortDirection direction)
+{
+    public string FieldName { get; init; } = fieldName;
+    public ListSortDirection Direction { get; init; } = direction;
+}