Add note about versions.

Author: JakeRadMSFT

README.md

@@ -40,6 +40,8 @@ Download or clone this repo and open the `csharp-101` folder in VS Code to get s
 
 Download or clone this repo and open the `machine-learning` folder in Visual Studio 2022 to get started with the machine-learning notebooks. Or, if you want just tap on one of the Notebook links below and automatically have it open in Visual Studio!
 
+**Links below require [Visual Studio 2022](https://visualstudio.microsoft.com/downloads/) and [Notebook Editor Extension](https://marketplace.visualstudio.com/items?itemName=MLNET.notebook) 0.3.4 or greater **
+
 ### Getting Started Series
 
 | # | Topic                                      | Notebook Link         |