Add CoinMarketCap cryptocurrencies source

CHANGELOG.md

@@ -9,6 +9,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) a
 ### Added
 
 - This change log file.
+- CoinMarketCap as a source for cryptocurrencies.
 
 ### Fixed
 

README.md

@@ -1,8 +1,9 @@
 # PHP Crypto Currencies
 
-This library provides up-to-date list of cryptocurrencies retrieved from various crypto exchanges. It uses the following crypto exchanges.
+This library provides up-to-date list of cryptocurrencies retrieved from various sources. It uses the following sources.
 
-- Binance
+- [Binance](https://binance-docs.github.io/apidocs/spot/en/)
+- [CoinMarketCap](https://coinmarketcap.com/api/)
 
 Please be aware that this library solely exists to provide cryptocurrencies for [moneyphp/money](https://github.com/moneyphp/money). Using this library for other purposes is at your own risk.
 
@@ -13,6 +14,10 @@ Install using composer.
 composer install
 ```
 
+Add environment variable for CoinMarketCap API key.
+```sh
+export COIN_MARKET_CAP_API_KEY=YOUR_API_KEY
+```
 Update currencies using composer.
 ```sh
 composer fetch-update

bin/fetch-update.php

@@ -3,6 +3,7 @@
 declare(strict_types=1);
 
 use MoneyPHP\CryptoCurrencies\Fetcher\BinanceFetcher;
+use MoneyPHP\CryptoCurrencies\Fetcher\CoinMarketCapFetcher;
 use MoneyPHP\CryptoCurrencies\Serializer\JsonSerializer;
 use MoneyPHP\CryptoCurrencies\Serializer\PhpExportSerializer;
 use MoneyPHP\CryptoCurrencies\Updater;
@@ -16,3 +17,6 @@
 $updater->writeWith(new Writer(), $cryptocurrencies, 'binance', new JsonSerializer());
 $updater->writeWith(new Writer(), $cryptocurrencies, 'binance', new PhpExportSerializer());
 
+$cryptocurrencies = $updater->fetchWith(new CoinMarketCapFetcher('https://pro-api.coinmarketcap.com/v1/cryptocurrency/map'));
+$updater->writeWith(new Writer(), $cryptocurrencies, 'coinmarketcap', new JsonSerializer());
+$updater->writeWith(new Writer(), $cryptocurrencies, 'coinmarketcap', new PhpExportSerializer());