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/Enums/Jellem.cs

@@ -0,0 +1,15 @@
+namespace Kemkas.Web.Db.Enums;
+
+[Flags]
+public enum Jellem : byte
+{
+    Semleges = 0,
+    Torvenyes = 1,
+    Kaotikus = 2,
+    Jo = 4,
+    TorvenyesJo = Torvenyes | Jo, // 5
+    KaotikusJo = Kaotikus | Jo, // 6
+    Gonosz = 8,
+    TorvenyesGonosz = Torvenyes | Gonosz, // 9
+    KaotikusGonosz = Kaotikus | Gonosz, // 10
+}