added basic create account

- add link in to creat in users.html
- AccountController
  - add getCreateAccount
  - add postCreateAccount
- add create.html
- add AccountForm to Account Request in Mapping.kt
- add AccountForm
- add addAccount to AccountRegistryService
- add accountRegistryCreate to WebClientCalls.kt
- add UsernameDuplicateException
- add AccountRegistryException
- add HlaejaException

src/main/kotlin/ltd/hlaeja/util/Mapping.kt

@@ -1,10 +1,18 @@
 package ltd.hlaeja.util
 
-import org.springframework.security.core.Authentication as SpringAuthentication
-
+import ltd.hlaeja.form.AccountForm
+import ltd.hlaeja.library.accountRegistry.Account
 import ltd.hlaeja.library.accountRegistry.Authentication
+import org.springframework.security.core.Authentication as SpringAuthentication
 
 fun SpringAuthentication.toAuthenticationRequest(): Authentication.Request = Authentication.Request(
     principal as String,
     credentials as String,
 )
+
+fun AccountForm.toAccountRequest(): Account.Request = Account.Request(
+    username = username,
+    password = password,
+    enabled = enabled,
+    roles = listOf("ROLE_${role.uppercase()}"),
+)