Initial commit

Interfaces/IChangeViewModel.cs

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+using ReceiptPDFBuilder.ViewModels;
+
+namespace ReceiptPDFBuilder.Interfaces
+{
+    interface IChangeViewModel
+    {
+        void PushViewModel(BaseViewModel model);
+        void PopViewModel();
+    }
+}

Interfaces/ITopLevelGrabber.cs

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+using Avalonia.Controls;
+
+namespace ReceiptPDFBuilder.Interfaces
+{
+    interface ITopLevelGrabber
+    {
+        TopLevel GetTopLevel();
+    }
+}