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/appsettings.Development.json

@@ -11,5 +11,12 @@
     "Key": {
       "Type": "Development"
     }
+  },
+  "ConnectionStrings": {
+    "DefaultConnection": "Host=127.0.0.1;Port=5432;User Id=kemkas;Password=kemkas-dev42"
+  },
+  "Email": {
+    "ApiKey": "YOUR-API-KEY",
+    "DomainName": "your email sending domain"
   }
 }