update mainwindow so it shows real installations

MetaforceInstaller.UI/ViewModels/MainWindowViewModel.cs

@@ -0,0 +1,28 @@
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+using MetaforceInstaller.Core.Models;
+
+namespace MetaforceInstaller.UI.ViewModels;
+
+public class MainWindowViewModel : INotifyPropertyChanged
+{
+    public event PropertyChangedEventHandler? PropertyChanged;
+
+    public ObservableCollection<InstallationData> Installations { get; set; } = new();
+
+    public void LoadInstallations(IEnumerable<InstallationData> data)
+    {
+        Installations.Clear();
+        foreach (var installation in data)
+        {
+            Installations.Add(installation);
+        }
+    }
+
+    protected virtual void OnPropertyChanged([CallerMemberName] string? propertyName = null)
+    {
+        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+    }
+}