Update README.md with project details, features, requirements, architecture, and data management for PLib video library manager.

src/PLib.Desktop/ViewModels/SortOption.cs

@@ -0,0 +1,21 @@
+namespace PLib.Desktop.ViewModels;
+
+public enum LibrarySort
+{
+    RecentlyAdded,
+    TitleAscending,
+    LongestFirst,
+    LargestFirst,
+}
+
+/// <summary>A sort order together with the label the combo box shows for it.</summary>
+public sealed record SortOption(LibrarySort Sort, string Label)
+{
+    public static IReadOnlyList<SortOption> All { get; } =
+    [
+        new(LibrarySort.RecentlyAdded, "Недавно добавленные"),
+        new(LibrarySort.TitleAscending, "По названию"),
+        new(LibrarySort.LongestFirst, "Сначала длинные"),
+        new(LibrarySort.LargestFirst, "Сначала большие"),
+    ];
+}