Add links to showcase apps.

readme.md

@@ -10,6 +10,8 @@ Avalonia is a cross-platform XAML-based UI framework providing a flexible stylin
 
 <img src="https://user-images.githubusercontent.com/6759207/84751662-7c79da00-afc5-11ea-8780-dda28db70b76.png" width="700" />
 
+([Xaml Control Gallery](https://github.com/AvaloniaUI/xamlcontrolsgallery))
+
 > **Note:** The UI theme you see in the picture above is still work-in-progress and will be available in the upcoming Avalonia 0.10.0 release. However, you can connect to our nightly build feed and install latest pre-release versions of Avalonia NuGet packages, if you are willing to help out with the development and testing. See [Using nightly build feed](https://github.com/AvaloniaUI/Avalonia/wiki/Using-nightly-build-feed) for more info.
 
 To see the status of some of our features, please see our [Roadmap](https://github.com/AvaloniaUI/Avalonia/issues/2239). You can also see what [breaking changes](https://github.com/AvaloniaUI/Avalonia/issues/3538) we have planned and what our [past breaking changes](https://github.com/AvaloniaUI/Avalonia/wiki/Breaking-Changes) have been. [Awesome Avalonia](https://github.com/AvaloniaCommunity/awesome-avalonia) is community-curated list of awesome Avalonia UI tools, libraries, projects and resources. Go and see what people are building with Avalonia!
@@ -31,11 +33,16 @@ Install-Package Avalonia.Desktop
 Examples of UIs built with Avalonia
 ![image](https://user-images.githubusercontent.com/4672627/84707589-5b69a880-af35-11ea-87a6-7ad57a31d314.png)
 
+([Synfonia](https://github.com/jmacato/Synfonia))
+
 ![image](https://user-images.githubusercontent.com/4672627/85069644-d8419000-b18a-11ea-8732-be9055bb61fd.PNG)
+([Xaml Control Gallery](https://github.com/AvaloniaUI/xamlcontrolsgallery))
 
 ![image](https://user-images.githubusercontent.com/4672627/85069659-dc6dad80-b18a-11ea-8375-39ef95315b5c.PNG)
+([Xaml Control Gallery](https://github.com/AvaloniaUI/xamlcontrolsgallery))
 
 ![image](https://user-images.githubusercontent.com/4672627/84708947-c3b98980-af37-11ea-8c9d-503334615bbf.png)
+([Xaml Control Gallery](https://github.com/AvaloniaUI/xamlcontrolsgallery))
 
 ## JetBrains Rider