adding hidden basic asp.net core backend (#30)

Base functionality:

    DB
    email sending
    user registration & login
    storing new characters and reading them back

Notes:

    Functionality is "hidden" with no links pointing to it.
    Most pages are scaffolded and not reviewed at all :(
    local Dev db setup is pushed to git
    NO local email setup :(

Kemkas.Web/Areas/Identity/Pages/Account/RegisterConfirmation.cshtml.cs

@@ -0,0 +1,54 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+#nullable disable
+
+using System;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Authorization;
+using Kemkas.Web.Db.Models;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.AspNetCore.Identity.UI.Services;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+using Microsoft.AspNetCore.WebUtilities;
+
+namespace Kemkas.Web.Areas.Identity.Pages.Account
+{
+    [AllowAnonymous]
+    public class RegisterConfirmationModel : PageModel
+    {
+        private readonly UserManager<ApplicationUser> _userManager;
+        private readonly IEmailSender _sender;
+
+        public RegisterConfirmationModel(UserManager<ApplicationUser> userManager, IEmailSender sender)
+        {
+            _userManager = userManager;
+            _sender = sender;
+        }
+
+        /// <summary>
+        ///     This API supports the ASP.NET Core Identity default UI infrastructure and is not intended to be used
+        ///     directly from your code. This API may change or be removed in future releases.
+        /// </summary>
+        public string Email { get; set; }
+
+        public async Task<IActionResult> OnGetAsync(string email, string returnUrl = null)
+        {
+            if (email == null)
+            {
+                return RedirectToPage("/Index");
+            }
+
+            var user = await _userManager.FindByEmailAsync(email);
+            if (user == null)
+            {
+                return NotFound($"Unable to load user with email '{email}'.");
+            }
+
+            Email = email;
+
+            return Page();
+        }
+    }
+}