Add date format pickers (settings not used yet)

src/Models/DateDisplayFormat.cs

@@ -0,0 +1,35 @@
+using MayShow.Helpers;
+
+namespace MayShow.Models;
+
+class DateDisplayFormat : ChangeNotifier
+{
+    private string _title;
+    private string _example;
+    private string _value;
+
+    public DateDisplayFormat(string title, string example, string value)
+    {
+        _title = title;
+        _example = example;
+        _value = value;
+    }
+
+    public string Title
+    {
+        get => _title;
+        set { _title = value; NotifyPropertyChanged(); }
+    }
+
+    public string Example
+    {
+        get => _example;
+        set { _example = value; NotifyPropertyChanged(); }
+    }
+
+    public string Value
+    {
+        get => _value;
+        set { _value = value; NotifyPropertyChanged(); }
+    }
+}