add BCV Exchange Rate API to Currency Exchange

FIX: add BCV API to exchange currency

README.md

@@ -464,6 +464,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Amdoren](https://www.amdoren.com/currency-api/) | Free currency API with over 150 currencies | `apiKey` | Yes | Unknown |
 | [apilayer fixer.io](https://fixer.io) | Exchange rates and currency conversion | `apiKey` | No | Unknown |
 | [Bank of Russia](https://www.cbr.ru/development/SXML/) | Exchange rates and currency conversion | No | Yes | Unknown |
+| [BCV (Banco Central de Venezuela) Exchange rate](https://bcv-api.rafnixg.dev/docs) | Exchange rates of the BCV (Central Bank of Venezuela) API | `apiKey` | Yes | No |
 | [Currency-api](https://github.com/fawazahmed0/currency-api#readme) | Free Currency Exchange Rates API with 150+ Currencies & No Rate Limits | No | Yes | Yes |
 | [CurrencyFreaks](https://currencyfreaks.com/) | Provides current and historical currency exchange rates with free plan 1K requests/month | `apiKey` | Yes | Yes |
 | [Currencylayer](https://currencylayer.com/documentation) | Exchange rates and currency conversion | `apiKey` | Yes | Unknown |