Add-in Graph Control docs

Can't add examples back as we haven't rebuilt the Graph Controls library yet.

Author: michael-hawker

Microsoft.Toolkit.Uwp.SampleApp/Microsoft.Toolkit.Uwp.SampleApp.csproj

@@ -272,6 +272,9 @@
     <Content Include="Icons\More.png" />
     <Content Include="Icons\Notifications.png" />
     <Content Include="Icons\Services.png" />
+    <Content Include="SamplePages\Graph\LoginButton.png" />
+    <Content Include="SamplePages\Graph\PeoplePicker.png" />
+    <Content Include="SamplePages\Graph\PersonView.png" />
     <Content Include="SamplePages\Primitives\SwitchPresenter.png" />
     <Content Include="SamplePages\TabbedCommandBar\TabbedCommandBar.png" />
     <Content Include="SamplePages\Animations\Effects\FadeBehavior.png" />
@@ -613,6 +616,9 @@
     <Content Include="SamplePages\VisualEffectFactory\VisualEffectFactory.bind" />
     <Content Include="SamplePages\Animations\Activities\InvokeActionsActivityCode.bind" />
     <Content Include="SamplePages\Animations\Activities\StartAnimationActivityCode.bind" />
+    <Content Include="SamplePages\Graph\LoginButtonXaml.bind" />
+    <Content Include="SamplePages\Graph\PeoplePickerXaml.bind" />
+    <Content Include="SamplePages\Graph\PersonViewXaml.bind" />
   </ItemGroup>
   <ItemGroup>
     <Compile Include="App.xaml.cs">