feature: add worktree support (#205)

src/Views/AddWorktree.axaml.cs

@@ -0,0 +1,28 @@
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Platform.Storage;
+
+namespace SourceGit.Views
+{
+    public partial class AddWorktree : UserControl
+    {
+        public AddWorktree()
+        {
+            InitializeComponent();
+        }
+
+        private async void SelectLocation(object sender, RoutedEventArgs e)
+        {
+            var options = new FolderPickerOpenOptions() { AllowMultiple = false };
+            var toplevel = TopLevel.GetTopLevel(this);
+            if (toplevel == null)
+                return;
+
+            var selected = await toplevel.StorageProvider.OpenFolderPickerAsync(options);
+            if (selected.Count == 1)
+                TxtLocation.Text = selected[0].Path.LocalPath;
+
+            e.Handled = true;
+        }
+    }
+}