supports navigate to data source page by clicking data source name in exchange rates data page

pkg/exchangerates/euro_central_bank_datasource.go

@@ -10,6 +10,7 @@ import (
 )
 
 const euroCentralBankExchangeRateUrl = "https://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml"
+const euroCentralBankExchangeRateReferenceUrl = "https://www.ecb.europa.eu/stats/policy_and_exchange_rates/euro_reference_exchange_rates/html/index.en.html"
 const euroCentralBankDataSource = "European Central Bank"
 const euroCentralBankBaseCurrency = "EUR"
 
@@ -56,6 +57,7 @@ func (e *EuroCentralBankExchangeRateData) ToLatestExchangeRateResponse() *models
 
 	latestExchangeRateResp := &models.LatestExchangeRateResponse{
 		DataSource:    euroCentralBankDataSource,
+		ReferenceUrl:  euroCentralBankExchangeRateReferenceUrl,
 		Date:          latestEuroCentralBankExchangeRate.Date,
 		BaseCurrency:  euroCentralBankBaseCurrency,
 		ExchangeRates: exchangeRates,

pkg/models/exchange_rate.go

@@ -3,6 +3,7 @@ package models
 // LatestExchangeRateResponse returns a view-object which contains latest exchange rate
 type LatestExchangeRateResponse struct {
 	DataSource    string                `json:"dataSource"`
+	ReferenceUrl  string                `json:"referenceUrl"`
 	Date          string                `json:"date"`
 	BaseCurrency  string                `json:"baseCurrency"`
 	ExchangeRates []*LatestExchangeRate `json:"exchangeRates"`