Marks an Ash resource as a SCIM User resource per RFC 7643 §4.1.

Add to your user resource:

defmodule MyApp.Accounts.User do
  use Ash.Resource,
    domain: MyApp.Accounts,
    extensions: [AshAuthentication, AshScim.User]

  scim do
    map :userName, attribute: :email
    map :active, attribute: :active

    complex :name do
      map :givenName, attribute: :first_name
      map :familyName, attribute: :last_name
    end

    multivalued :emails do
      map :value, attribute: :email
      map :primary, value: true
    end
  end

  # ... attributes, actions, etc.
end

See AshScim.Dsl.Map, AshScim.Dsl.Complex, and AshScim.Dsl.Multivalued for the per-entity options.