update overview.md

Author: sandorfr

Extension/Screenshots/Custom-Registries.png

@@ -1,7 +1,7 @@
 # Yarn Build and Release Tasks
 
 [Yarn](https://yarnpkg.com/) is Facebook's npm alternative. It is the fast, reliable and secure dependency management. 
-This extension brings the power of Yarn to Visual Studio Team Services Build and Release Management.
+This extension brings the power of Yarn to Visual Studio Team Services Build and Release Management. It enables use to use yarn with against official npm registry or any registry you like such as Myget or [Visual Studio Team Services Package Management](https://marketplace.visualstudio.com/items?itemName=ms.feed#).
 
 ![GeekLearning Loves Yarn](Screenshots/GeekLearningLovesYarn.png)
 
@@ -19,6 +19,10 @@ After installing the extension, you can add one (or more) of the tasks to a new
 
 ![add-task](Screenshots/Add-Tasks.png)
 
+Starting with version `1.x`, you can configure custom registries directly in the task settings:
+
+![Custom Registries](Screenshots/Custom-Registries.png)
+
 ## Learn more
 
 The [source](https://github.com/geeklearningio/gl-vsts-tasks-yarn) for this extension is on GitHub. Take, fork, and extend.