Add identity first iteration

Hcs.WebApp/Identity/IdentityComponentsEndpointRouteBuilderExtensions.cs

@@ -0,0 +1,27 @@
+using Hcs.WebApp.Data;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.AspNetCore.Mvc;
+using System.Security.Claims;
+
+namespace Hcs.WebApp.Identity
+{
+    internal static class IdentityComponentsEndpointRouteBuilderExtensions
+    {
+        public static IEndpointConventionBuilder MapAdditionalIdentityEndpoints(this IEndpointRouteBuilder endpoints)
+        {
+            ArgumentNullException.ThrowIfNull(endpoints);
+
+            var accountGroup = endpoints.MapGroup("/account");
+            accountGroup.MapPost("/logout", async (
+                ClaimsPrincipal user,
+                SignInManager<AppUser> signInManager,
+                [FromForm] string returnUrl) =>
+            {
+                await signInManager.SignOutAsync();
+                return TypedResults.LocalRedirect($"~/{returnUrl}");
+            });
+
+            return accountGroup;
+        }
+    }
+}