Add initial project structure with basic view models, views, and resources

CryptoPortfolio Tracker/Views/MainWindow.axaml.cs

@@ -0,0 +1,12 @@
+using Avalonia.Controls;
+using Ursa.Controls;
+
+namespace CryptoPortfolio_Tracker.Views;
+
+public partial class MainWindow : UrsaWindow
+{
+    public MainWindow()
+    {
+        InitializeComponent();
+    }
+}