Extended the ICryptoStatsSource with a new method that allows the caller to list all available cryptocurrencies.

Implemented the new method in the Coingecko source.

Author: topnax

CryptoStatsSource/CoingeckoSource.cs

@@ -23,5 +23,8 @@ public CoingeckoSource()
         public async Task<List<MarketEntry>> GetMarketEntries(string currency, params string[] ids) => await _client
                 .GetRequest("coins/markets").AddQueryParameter("vs_currency", currency)
                 .AddQueryParameter("ids", String.Join(",", ids)).ExecuteAsync<List<MarketEntry>>();
+        
+        public async Task<List<Cryptocurrency>> GetAvailableCryptocurrencies() => await _client
+                .GetRequest("coins/list").ExecuteAsync<List<Cryptocurrency>>();
     }
 }

CryptoStatsSource/CryptoStatsSource.cs

@@ -7,5 +7,7 @@ namespace CryptoStatsSource
     public interface ICryptoStatsSource
     {
         public Task<List<MarketEntry>> GetMarketEntries(string currency, params string[] ids);
+        
+        public Task<List<Cryptocurrency>> GetAvailableCryptocurrencies();
     }
 }