Add Open Graph metadata for the front page (#6708)

Address #6678

Author: joelverhagen

src/NuGetGallery/Content/gallery/img/logo-og-600x600.png

@@ -1290,6 +1290,7 @@
     <Content Include="Areas\Admin\DynamicData\PageTemplates\ListDetails.aspx" />
     <Content Include="Content\admin\SupportRequestStyles.css" />
     <Content Include="Content\fabric.css" />
+    <Content Include="Content\gallery\img\logo-og-600x600.png" />
     <Content Include="Content\Images\icons\apiKey.png" />
     <Content Include="Content\Images\icons\apiKeyExpired.png" />
     <Content Include="Content\Images\icons\apiKeyLegacy.png" />
@@ -1299,7 +1300,51 @@
     <Content Include="Content\Images\icons\edit.png" />
     <Content Include="Content\Images\icons\expire.png" />
     <Content Include="Content\Images\icons\regenerate.png" />
-    <Content Include="Content\gallery\**\*" />
+    <Content Include="Content\gallery\css\bootstrap-theme.css" />
+    <Content Include="Content\gallery\css\bootstrap.css" />
+    <Content Include="Content\gallery\css\fabric.css" />
+    <Content Include="Content\gallery\img\api-key-256x256.png" />
+    <Content Include="Content\gallery\img\api-key-expired-256x256.png" />
+    <Content Include="Content\gallery\img\api-key-expired.svg" />
+    <Content Include="Content\gallery\img\api-key-legacy-256x256.png" />
+    <Content Include="Content\gallery\img\api-key-legacy.svg" />
+    <Content Include="Content\gallery\img\api-key-new-256x256.png" />
+    <Content Include="Content\gallery\img\api-key-new.svg" />
+    <Content Include="Content\gallery\img\api-key.svg" />
+    <Content Include="Content\gallery\img\blue-circle-225x225.png" />
+    <Content Include="Content\gallery\img\blue-circle.svg" />
+    <Content Include="Content\gallery\img\circuit-board.svg" />
+    <Content Include="Content\gallery\img\default-package-icon-256x256.png" />
+    <Content Include="Content\gallery\img\default-package-icon.svg" />
+    <Content Include="Content\gallery\img\dotnet-foundation-42x42.png" />
+    <Content Include="Content\gallery\img\dotnet-foundation.svg" />
+    <Content Include="Content\gallery\img\facebook-24x24.png" />
+    <Content Include="Content\gallery\img\facebook.svg" />
+    <Content Include="Content\gallery\img\git-32x32.png" />
+    <Content Include="Content\gallery\img\git.svg" />
+    <Content Include="Content\gallery\img\github-32x32.png" />
+    <Content Include="Content\gallery\img\github.svg" />
+    <Content Include="Content\gallery\img\logo-footer-184x57.png" />
+    <Content Include="Content\gallery\img\logo-footer.svg" />
+    <Content Include="Content\gallery\img\logo-header-94x29.png" />
+    <Content Include="Content\gallery\img\logo-header.svg" />
+    <Content Include="Content\gallery\img\manage-organizations-260x150.png" />
+    <Content Include="Content\gallery\img\manage-organizations.svg" />
+    <Content Include="Content\gallery\img\microsoft-account-24x24.png" />
+    <Content Include="Content\gallery\img\microsoft-account.svg" />
+    <Content Include="Content\gallery\img\orange-circle-225x225.png" />
+    <Content Include="Content\gallery\img\orange-circle.svg" />
+    <Content Include="Content\gallery\img\purple-circle-225x225.png" />
+    <Content Include="Content\gallery\img\purple-circle.svg" />
+    <Content Include="Content\gallery\img\reserved-indicator-20x20.png" />
+    <Content Include="Content\gallery\img\reserved-indicator-256x256.png" />
+    <Content Include="Content\gallery\img\reserved-indicator-25x25.png" />
+    <Content Include="Content\gallery\img\reserved-indicator.svg" />
+    <Content Include="Content\gallery\img\rss-36x36.png" />
+    <Content Include="Content\gallery\img\rss.svg" />
+    <Content Include="Content\gallery\img\twitter-24x24.png" />
+    <Content Include="Content\gallery\img\twitter-36x36.png" />
+    <Content Include="Content\gallery\img\twitter.svg" />
     <Content Include="Content\themes\base\images\animated-overlay.gif" />
     <Content Include="Content\themes\base\images\ui-bg_flat_0_aaaaaa_40x100.png" />
     <Content Include="Content\themes\base\images\ui-bg_flat_75_ffffff_40x100.png" />

src/NuGetGallery/NuGetGallery.csproj

@@ -6,6 +6,16 @@
     ViewBag.HasJumbotron = true;
 }
 
+@section SocialMeta {
+    <meta name="twitter:card" content="summary">
+    <meta name="twitter:site" content="@("@nuget")">
+
+    <meta property="og:title" content="@(Config.Current.Brand) @(String.IsNullOrWhiteSpace(ViewBag.Title) ? "" : "| " + ViewBag.Title)" />
+    <meta property="og:url" content="@(Url.Home(relativeUrl: false))" />
+    <meta property="og:description" content="The NuGet Gallery is the central package repository for NuGet, the package manager for .NET." />
+    <meta property="og:image" content="@(Url.Absolute("~/Content/gallery/img/logo-og-600x600.png"))" />
+}
+
 @if (Model.ShowTransformModal)
 {
     <script type="text/javascript">