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/Db/Models/ApplicationUser.cs

@@ -0,0 +1,7 @@
+using Microsoft.AspNetCore.Identity;
+
+namespace Kemkas.Web.Db.Models;
+
+public class ApplicationUser : IdentityUser<int>
+{
+}