Added user authorization (not tested)

FoxTube.Core/FoxTube.Core.csproj

@@ -136,6 +136,7 @@
     <Compile Include="Helpers\Metrics.cs" />
     <Compile Include="Helpers\Settings.cs" />
     <Compile Include="Helpers\StoreInterop.cs" />
+    <Compile Include="Helpers\UserControl.cs" />
     <Compile Include="Helpers\Utils.cs" />
     <Compile Include="Models\Inbox\Changelog.cs" />
     <Compile Include="Models\Inbox\DeveloperMessage.cs" />
@@ -144,6 +145,7 @@
     <Compile Include="Models\Notifications.cs" />
     <Compile Include="Models\PageView.cs" />
     <Compile Include="Models\SearchSuggestion.cs" />
+    <Compile Include="Models\User.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <EmbeddedResource Include="Properties\FoxTube.Core.rd.xml" />
   </ItemGroup>
@@ -151,6 +153,15 @@
     <PackageReference Include="AngleSharp">
       <Version>0.13.0</Version>
     </PackageReference>
+    <PackageReference Include="Google.Apis.Auth">
+      <Version>1.42.0</Version>
+    </PackageReference>
+    <PackageReference Include="Google.Apis.Oauth2.v2">
+      <Version>1.42.0.1602</Version>
+    </PackageReference>
+    <PackageReference Include="Google.Apis.YouTube.v3">
+      <Version>1.42.0.1758</Version>
+    </PackageReference>
     <PackageReference Include="Microsoft.AppCenter.Analytics">
       <Version>2.6.1</Version>
     </PackageReference>
@@ -175,6 +186,11 @@
       <Name>Visual C++ 2015 Runtime for Universal Windows Platform Apps</Name>
     </SDKReference>
   </ItemGroup>
+  <ItemGroup>
+    <Reference Include="YouTube.API">
+      <HintPath>..\Src\YouTube.API.dll</HintPath>
+    </Reference>
+  </ItemGroup>
   <PropertyGroup Condition=" '$(VisualStudioVersion)' == '' or '$(VisualStudioVersion)' &lt; '14.0' ">
     <VisualStudioVersion>14.0</VisualStudioVersion>
   </PropertyGroup>