Add more VS gallery instructions

Author: shana

README.md

@@ -5,11 +5,15 @@ Most of the extension UI lives in the Team Explorer pane, which is available fro
 
 Official builds of this extension are available at [the official website](https://visualstudio.github.com).
 
+[![Join the chat at https://gitter.im/github/VisualStudio](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/github/VisualStudio?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+
+## Installing beta versions
+
 Older and pre-release/beta/untested versions are available at [the releases page](https://github.com/github/VisualStudio/releases), and also via a custom gallery feed for Visual Studio.
 
 You can configure the gallery by going to `Tools / Options / Extensions and Updates` and adding a new gallery with the url https://visualstudio.github.com/releases/feed.rss. The gallery will now be available from `Tools / Extensions and Updates`.
 
-[![Join the chat at https://gitter.im/github/VisualStudio](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/github/VisualStudio?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+Beta releases will have `(beta)` in their title in the gallery, following the version number. You can view the release notes in the gallery by hovering over the description, or by clicking the `Release Notes` link on the right side.
 
 ## Build requirements