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

lib/iban_ex/country/ro.ex

@@ -0,0 +1,17 @@
+defmodule IbanEx.Country.RO do
+  @moduledoc """
+  Romania IBAN parsing rules
+
+  ## Examples
+
+    iex> %IbanEx.Iban{country_code: "RO", check_digits: "49", bank_code: "AAAA", branch_code: nil, national_check: nil, account_number: "1B31007593840000"}
+    iex> |> IbanEx.Country.RO.to_string()
+    "RO 49 AAAA 1B31007593840000"
+
+  """
+
+  @size 24
+  @rule ~r/^(?<bank_code>[A-Z]{4})(?<account_number>[0-9A-Z]{16})$/i
+
+  use IbanEx.Country.Template
+end