Update README.md

README.md

@@ -9,6 +9,8 @@ both Windows and Linux/Unix.
 
 ![Sample app](https://raw.githubusercontent.com/migueldeicaza/gui.cs/master/docfx/sample.png)
 
+A prensetation of this was part of the [Retro.NET](https://channel9.msdn.com/Events/dotnetConf/2018/S313) talk at .NET Conf 2018 [Slides](https://tirania.org/Retro.pdf)
+
 The toolkit contains various controls for building text user interfaces:
 
 * [Buttons](https://migueldeicaza.github.io/gui.cs/api/Terminal.Gui/Terminal.Gui.Button.html)