embed font.

src/Avalonia.Dialogs/AboutAvaloniaDialog.xaml

@@ -6,8 +6,8 @@
         MinHeight="475"
         Title="About Avalonia"
         Background="Purple"
-        x:Class="Avalonia.Dialogs.AboutAvaloniaDialog"
-        FontFamily="Roboto Light">
+        FontFamily="/Assets/Roboto-Light.ttf"
+        x:Class="Avalonia.Dialogs.AboutAvaloniaDialog">
   <Window.Styles>
     <Style>
       <Style.Resources>

src/Avalonia.Dialogs/AboutAvaloniaDialog.xaml.cs

@@ -3,7 +3,7 @@
 
 using System.Diagnostics;
 using System.Runtime.InteropServices;
-using Avalonia.Controls; 
+using Avalonia.Controls;
 using Avalonia.Markup.Xaml;
 
 namespace Avalonia.Dialogs
@@ -17,12 +17,12 @@ namespace Avalonia.Dialogs
             DataContext = this;
         }
 
-        public void OpenGithub ()
+        public void OpenGithub()
         {
             OpenBrowser("https://github.com/AvaloniaUI/Avalonia/");
         }
 
-        public void OpenWebsite ()
+        public void OpenWebsite()
         {
             OpenBrowser("https://avaloniaui.net/");
         }

src/Avalonia.Dialogs/Avalonia.Dialogs.csproj

@@ -7,6 +7,7 @@
     <AvaloniaResource Include="**\*.xaml">
       <SubType>Designer</SubType>
     </AvaloniaResource>
+    <AvaloniaResource Include="Assets\*" />
   </ItemGroup>
 
   <Import Project="..\..\build\BuildTargets.targets" />