Update README.md

SweathaBharathi · web-flow · commit 886f34973358 · 2025-09-04T19:18:22.000+05:30
diff --git a/README.md b/README.md
@@ -11,3 +11,4 @@ int checkedCount = treeView1.CheckedNodes.Count;
 ```csharp
 Dim checkedCount As Integer = treeView1.CheckedNodes.Count
 ```
+![count of checked nodes](output.png)
