Added CryptoComSymbol ContractSize property (#18)

Author: nils2525

CryptoCom.Net/Clients/ExchangeApi/CryptoComRestClientExchangeApiShared.cs

@@ -903,7 +903,7 @@ async Task<ExchangeWebResult<SharedFuturesSymbol[]>> IFuturesSymbolRestClient.Ge
                 PriceDecimals = s.PriceDecimals,
                 QuantityDecimals = s.QuantityDecimals,
                 DeliveryTime = s.ExpiryTime,
-                ContractSize = 1,
+                ContractSize = s.ContractSize > 0 ? s.ContractSize.Value : 1m,
                 MaxLongLeverage = s.MaxLeverage,
                 MaxShortLeverage = s.MaxLeverage
             }).ToArray());

CryptoCom.Net/Objects/Models/CryptoComSymbol.cs

@@ -67,6 +67,11 @@ public record CryptoComSymbol
         [JsonPropertyName("qty_tick_size")]
         public decimal QuantityTickSize { get; set; }
         /// <summary>
+        /// ["<c>contract_size</c>"] Contract size
+        /// </summary>
+        [JsonPropertyName("contract_size")]
+        public decimal? ContractSize { get; set; }
+        /// <summary>
         /// ["<c>max_leverage</c>"] Max leverage
         /// </summary>
         [JsonPropertyName("max_leverage")]