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/Osztaly.cs

@@ -0,0 +1,15 @@
+namespace Kemkas.Web.Db.Enums;
+
+public enum Osztaly
+{
+    Error = 0, // for unset enum value mapping
+    Harcos = 1,
+    Ijasz = 2,
+    Amazon = 3,
+    Kaloz = 4,
+    Barbar = 5,
+    Pap = 6,
+    Tolvaj = 7,
+    Varazslo = 8,
+    Illuzionista = 9,
+}