feat: Add support for VND (Vietnamese Dong) - #516

Process completed with exit code 2.

Element implicitly has an 'any' type because expression of type '"USD" | "EUR" | "JPY" | "BGN" | "CZK" | "DKK" | "GBP" | "HUF" | "PLN" | "RON" | "SEK" | "CHF" | "ISK" | "NOK" | "TRY" | "AUD" | "BRL" | "CAD" | "CNY" | "HKD" | "IDR" | "ILS" | "INR" | ... 7 more ... | "ZAR"' can't be used to index type '{ USD: { name: string; symbol_native: string; symbol: string; code: string; name_plural: string; rounding: number; decimal_digits: number; }; EUR: { name: string; symbol_native: string; symbol: string; code: string; name_plural: string; rounding: number; decimal_digits: number; }; ... 28 more ...; ZAR: { ...; }; } |...'.