Add project files.

Core.Cerberos.Adapters/Contracts/ITokenService.cs

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+// ***********************************************************************
+// <copyright file="ITokenService.cs">
+//     Heath
+// </copyright>
+// ***********************************************************************
+
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Core.Cerberos.Adapters.Contracts
+{
+    /// <summary>
+    /// Interface for authenticacion service.
+    /// </summary>
+    public interface ITokenService
+    {
+        /// <summary>
+        /// Refreshes the access token.
+        /// </summary>
+        string GenerateAccessToken(TokenAdapter adapter);
+
+        /// <summary>
+        /// Refreshes the access token.
+        /// </summary>
+        IActionResult RefreshAccessToken(HttpContext context, TokenAdapter adapter);
+
+        /// <summary>
+        /// Extracts the user email claim from the http context.
+        /// </summary>
+        string GetEmailClaim(HttpContext httpContext);
+    }
+}