Update Readme

Author: ricaun

README.md

@@ -8,6 +8,16 @@
 
 This project was generated by the [ricaun.AppLoader](https://ricaun.com/AppLoader/) Revit plugin.
 
+## Description
+
+This `RevitAddin` demonstrates how to override existing Revit commands using the Revit API `CreateAddInCommandBinding` method using a `Windows Presentation Foundation` to list all available `PostableCommand` and enable overwrite the `CanExecute `, `BeforeExecuted`, and `Executed `.
+
+<img width="1864" height="1304" alt="image" src="https://github.com/user-attachments/assets/3220ba06-a8c7-4ba0-9a77-b930bc69f6f5" />
+
+### References - Overriding a Revit command
+
+* https://help.autodesk.com/view/RVT/2026/ENU/?guid=Revit_API_Revit_API_Developers_Guide_Advanced_Topics_Commands_html
+
 ## Installation
 
 * Download and install [RevitAddin.CommandBindingTester.exe](https://github.com/ricaun-io/RevitAddin.CommandBindingTester/releases/latest/download/RevitAddin.CommandBindingTester.zip)