Got Avalonia.Ui working.

Gamenight.Ui/Gamenight.Ui/Views/SideBarView.axaml.cs

@@ -0,0 +1,17 @@
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace Gamenight.Ui.Views;
+
+public partial class SideBarView : UserControl
+{
+  public SideBarView()
+  {
+    InitializeComponent();
+  }
+
+  private void InitializeComponent()
+  {
+    AvaloniaXamlLoader.Load(this);
+  }
+}