Add project files.

Core.Cerberos.Provider/Providers/Helper.cs

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+// ***********************************************************************
+// <copyright file="Helper.cs">
+//     Heath
+// </copyright>
+// ***********************************************************************
+
+using Microsoft.AspNetCore.Http;
+using System.Security.Claims;
+
+namespace Core.Cerberos.Provider.Providers
+{
+    /// <summary>
+    /// Provides helper methods for common operations.
+    /// </summary>
+    public static class Helper
+    {
+        /// <summary>
+        /// Retrieves the email address of the authenticated user from the HTTP context.
+        /// </summary>
+        /// <param name="httpContextAccessor">The IHttpContextAccessor instance to access the current HTTP context.</param>
+        /// <returns>The email address of the authenticated user, or an empty string if not available.</returns>
+        public static string GetEmail(IHttpContextAccessor httpContextAccessor)
+        {
+            return httpContextAccessor.HttpContext?.User?.FindFirst(ClaimTypes.Email)?.Value ?? "";
+        }
+    }
+}