Update Google authentication setup instructions (#36545)

* Update Google authentication setup instructions

Added instructions to install Google authentication package

* Update Google login tutorial with new date and command

Updated the date and improved the package installation command formatting.  package and add command were reversed.

---------

Co-authored-by: Wade Pickett <wpickett@microsoft.com>

Author: tesar-tech

aspnetcore/security/authentication/social/google-logins.md

@@ -4,7 +4,7 @@ author: wadepickett
 description: This tutorial demonstrates the integration of Google account user authentication into an existing ASP.NET Core app.
 ms.author: wpickett
 ms.custom: mvc
-ms.date: 06/18/2025
+ms.date: 12/26/2025
 uid: security/authentication/google-logins
 ---
 # Google external login setup in ASP.NET Core
@@ -71,6 +71,12 @@ Manage API credentials and usage in the [API Console](https://console.developers
 
 ## Configure Google authentication
 
+Add the [`Microsoft.AspNetCore.Authentication.Google`](https://www.nuget.org/packages/Microsoft.AspNetCore.Authentication.Google) nuget package:
+
+```dotnetcli
+dotnet add package Microsoft.AspNetCore.Authentication.Google
+```
+
 :::moniker range=">= aspnetcore-6.0"
 
 Add the authentication service to the `Program` file: