Add link to sample usage data

Author: shana

src/GitHub.VisualStudio/UI/Settings/OptionsControl.xaml

@@ -77,6 +77,9 @@
         <CheckBox x:Name="chkMetrics" VerticalAlignment="Center" />
         <Label Content="{x:Static prop:Resources.Options_MetricsLabel}" />
       </WrapPanel>
+      <TextBlock>
+        <Hyperlink ToolTip="https://visualstudio.github.com/samples.html" NavigateUri="https://visualstudio.github.com/samples.html" RequestNavigate="Hyperlink_RequestNavigate"><TextBlock Text="{x:Static prop:Resources.learnMoreLink}"/></Hyperlink>
+      </TextBlock>
     </DockPanel>
   </GroupBox>
 </UserControl>

src/GitHub.VisualStudio/UI/Settings/OptionsControl.xaml.cs

@@ -1,17 +1,5 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using System.Windows;
-using System.Windows.Controls;
-using System.Windows.Data;
-using System.Windows.Documents;
-using System.Windows.Input;
-using System.Windows.Media;
-using System.Windows.Media.Imaging;
-using System.Windows.Navigation;
-using System.Windows.Shapes;
+using System.Windows.Controls;
+using GitHub.Services;
 
 namespace GitHub.VisualStudio.UI
 {
@@ -30,5 +18,11 @@ public bool CollectMetrics
             get { return chkMetrics.IsChecked ?? false; }
             set { chkMetrics.IsChecked = value; }
         }
+
+        private void Hyperlink_RequestNavigate(object sender, System.Windows.Navigation.RequestNavigateEventArgs e)
+        {
+            var browser = Services.DefaultExportProvider.GetExportedValue<IVisualStudioBrowser>();
+            browser?.OpenUrl(e.Uri);
+        }
     }
 }