Update ContextFlyout

Ghost.Editor/View/Controls/ProjectBrowser.Menu.cs

@@ -20,4 +20,34 @@ internal partial class ProjectBrowser
             Verb = "open"
         });
     }
+
+    [ContextMenuItem("project-browser", "Create/Folder")]
+    private static void CreateFolder()
+    {
+        // TODO: Use AssetService
+
+        var viewModel = LastFocused?.ViewModel;
+        if (viewModel is null)
+        {
+            return;
+        }
+        
+        var currentDir = viewModel.CurrentDirectoryPath;
+        if (!Directory.Exists(currentDir))
+        {
+            return;
+        }
+
+        var newFolderPath = Path.Combine(currentDir, "New Folder");
+        var folderIndex = 1;
+        while (Directory.Exists(newFolderPath))
+        {
+            newFolderPath = Path.Combine(currentDir, $"New Folder ({folderIndex})");
+            folderIndex++;
+        }
+
+        Directory.CreateDirectory(newFolderPath);
+        // Refresh the view model to show the new folder
+        viewModel.NavigateToDirectory(currentDir);
+    }
 }