Added first non SEPA countries

lib/iban_ex/country/ba.ex

@@ -0,0 +1,42 @@
+defmodule IbanEx.Country.BA do
+  @moduledoc """
+  Bosnia and Herzegovina IBAN parsing rules
+
+  ## Examples
+
+  ```elixir
+      iex>  %IbanEx.Iban{
+      ...>    country_code: "BA",
+      ...>    check_digits: "39",
+      ...>    bank_code: "129",
+      ...>    branch_code: "007",
+      ...>    national_check: "94",
+      ...>    account_number: "94010284"
+      ...>  }
+      ...>  |> IbanEx.Country.BA.to_string()
+      "BA 39 129 007 94010284 94"
+  ```
+  """
+
+  @size 20
+  @rule ~r/^(?<bank_code>[0-9]{3})(?<branch_code>[0-9]{3})(?<account_number>[0-9]{8})(?<national_check>[0-9]{2})$/i
+
+  use IbanEx.Country.Template
+  @impl IbanEx.Country.Template
+  @spec to_string(Iban.t()) :: binary()
+  @spec to_string(Iban.t(), binary()) :: binary()
+  def to_string(
+        %Iban{
+          country_code: country_code,
+          check_digits: check_digits,
+          bank_code: bank_code,
+          branch_code: branch_code,
+          national_check: national_check,
+          account_number: account_number
+        } = _iban,
+        joiner \\ " "
+      ) do
+    [country_code, check_digits, bank_code, branch_code, account_number, national_check]
+    |> Enum.join(joiner)
+  end
+end