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/Manage/Disable2fa.cshtml

@@ -0,0 +1,25 @@
+@page
+@model Disable2faModel
+@{
+    ViewData["Title"] = "Disable two-factor authentication (2FA)";
+    ViewData["ActivePage"] = ManageNavPages.TwoFactorAuthentication;
+}
+
+<partial name="_StatusMessage" for="StatusMessage" />
+<h3>@ViewData["Title"]</h3>
+
+<div class="alert alert-warning" role="alert">
+    <p>
+        <strong>This action only disables 2FA.</strong>
+    </p>
+    <p>
+        Disabling 2FA does not change the keys used in authenticator apps. If you wish to change the key
+        used in an authenticator app you should <a asp-page="./ResetAuthenticator">reset your authenticator keys.</a>
+    </p>
+</div>
+
+<div>
+    <form method="post">
+        <button class="btn btn-danger" type="submit">Disable 2FA</button>
+    </form>
+</div>