Add protected admin scope with login

RazorPagesMovie/Pages/Admin/Index.cshtml

@@ -0,0 +1,11 @@
+@page
+@model RazorPagesMovie.Pages.Admin.IndexModel
+@{
+    ViewData["Title"] = "Admin";
+}
+
+<h1>Welcome, @User.Identity?.Name</h1>
+
+<form method="post" asp-page-handler="Logout">
+    <button type="submit" class="btn btn-secondary">Logout</button>
+</form>

RazorPagesMovie/Pages/Admin/Index.cshtml.cs

@@ -0,0 +1,19 @@
+using Microsoft.AspNetCore.Authentication;
+using Microsoft.AspNetCore.Authentication.Cookies;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+
+namespace RazorPagesMovie.Pages.Admin;
+
+public class IndexModel : PageModel
+{
+    public void OnGet()
+    {
+    }
+
+    public async Task<IActionResult> OnPostLogoutAsync()
+    {
+        await HttpContext.SignOutAsync(CookieAuthenticationDefaults.AuthenticationScheme);
+        return RedirectToPage("/Login");
+    }
+}