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/_StatusMessage.cshtml

@@ -0,0 +1,10 @@
+@model string
+
+@if (!String.IsNullOrEmpty(Model))
+{
+    var statusMessageClass = Model.StartsWith("Error") ? "danger" : "success";
+    <div class="alert alert-@statusMessageClass alert-dismissible" role="alert">
+        <button type="button" class="btn-close" data-bs-dismiss="alert" aria-label="Close"></button>
+        @Model
+    </div>
+}