Added all SEPA countries (IBANs from European Union countries) and minimal test coverage for countries

lib/iban_ex/country/va.ex

@@ -0,0 +1,17 @@
+defmodule IbanEx.Country.VA do
+  @moduledoc """
+  Vatican IBAN parsing rules
+
+  ## Examples
+
+    iex> %IbanEx.Iban{country_code: "VA", check_digits: "59", bank_code: "001", branch_code: nil, national_check: nil, account_number: "123000012345678"}
+    iex> |> IbanEx.Country.VA.to_string()
+    "VA 59 001 123000012345678"
+
+  """
+
+  @size 22
+  @rule ~r/^(?<bank_code>[0-9]{3})(?<account_number>[0-9]{15})$/i
+
+  use IbanEx.Country.Template
+end