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/Services/Character/CharacterValidationService.cs

@@ -0,0 +1,17 @@
+using Kemkas.Web.ViewModels;
+
+namespace Kemkas.Web.Services.Character;
+
+public interface ICharacterValidationService
+{
+    public string? Validate(CharacterDto dto);
+}
+
+public class CharacterValidationService : ICharacterValidationService
+{
+    public string? Validate(CharacterDto dto)
+    {
+        // TODO: add validation!!
+        return null;
+    }
+}