Added playlist renaming functionality.

Harmonia.WinUI/ViewModels/PlaylistItemViewModel.cs

@@ -9,6 +9,19 @@ public partial class PlaylistItemViewModel : ObservableObject
 {
     public Playlist Playlist { get; private set; }
 
+    private string _name = string.Empty;
+    public string Name
+    {
+        get
+        {
+            return _name;
+        }
+        set
+        {
+            SetProperty(ref _name, value);
+        }
+    }
+
     private string _summary = string.Empty;
     public string Summary
     {
@@ -41,6 +54,8 @@ public partial class PlaylistItemViewModel : ObservableObject
 
     private void UpdateMetaData()
     {
+        Name = Playlist.Name ?? "Untitled Playlist";
+
         TimeSpan total = TimeSpan.FromSeconds(Playlist.Songs.Sum(s => s.Song.Length.TotalSeconds));
         Summary = $"{Playlist.Songs.Count} songs / {total:h\\:mm\\:ss}";
     }