fix/LN-442-ADA-USD-price-serivice

src/.env.example

src/App/Enums/CurrencyEnum.php

src/App/Http/Integrations/CoinApi/CoinApiConnector.php

...pp/Http/Integrations/CoinApi/Requests/GetQuoteRequest.php

src/App/Http/Integrations/Coinbase/CoinbaseConnector.php

...p/Http/Integrations/Coinbase/Requests/GetQuoteRequest.php

...ttp/Integrations/Coinmarketcap/CoinMarketCapConnector.php

...p/Integrations/Coinmarketcap/Requests/GetQuoteRequest.php

src/App/Services/AdaUsdQuoteService.php

src/helpers.php

tests/AdaUsdQuoteServiceTest.php