Add project files.

WinGreedWPF/ChildForm.xaml.cs

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+using System.Windows;
+using WpfLibrary;
+
+namespace WinGreedWPF;
+public partial class ChildForm : Window
+{
+    private readonly IDataAccess _dataAccess;
+
+    public ChildForm(IDataAccess dataAccess)
+    {
+        InitializeComponent();
+        _dataAccess = dataAccess;
+        dataAccessInfo.Text = _dataAccess.GetData();
+    }
+}