Add Avalonia gui

KMeansGui/Shell/ShellViewModel.cs

@@ -0,0 +1,21 @@
+using System.Threading.Tasks;
+using Avalonia.Controls;
+using MvvmGen;
+
+namespace KMeansGui
+{
+    [ViewModel]
+    public partial class ShellViewModel
+    {
+
+
+        public async Task OpenCsvFileAsync(object parent)
+        {
+            if (parent is Window window)
+            {
+                var fileDialog = new OpenFileDialog();
+                var result = await fileDialog.ShowAsync(window);
+            }
+        }
+    }
+}