Add template project

Template/Data.cs

@@ -0,0 +1,21 @@
+using System.Collections.ObjectModel;
+using System.Text.Json;
+using Template.Properties;
+
+namespace Template;
+
+internal static class Data
+{
+    internal static ObservableCollection<ItemEntry> ItemEntries { get; private set; }
+
+    internal static void Load()
+    {
+        ItemEntries = JsonSerializer.Deserialize<ObservableCollection<ItemEntry>>(Settings.Default.Items);
+    }
+
+    internal static void Save()
+    {
+        Settings.Default.Items = JsonSerializer.Serialize(ItemEntries);
+        Settings.Default.Save();
+    }
+}