[Feature] Add currency/trading pair support for Cardano (ADA)

Author: dougdellolio

CoinbasePro/Shared/Types/Currency.cs

@@ -53,6 +53,7 @@ public enum Currency
         GRT,
         SUSHI,
         MATIC,
-        SKL
+        SKL,
+        ADA
     }
 }

CoinbasePro/Shared/Types/ProductType.cs

@@ -289,6 +289,14 @@ public enum ProductType
         [EnumMember(Value = "SKL-EUR")]
         SklEur,
         [EnumMember(Value = "SKL-GBP")]
-        SklGbp
+        SklGbp,
+        [EnumMember(Value = "ADA-USD")]
+        AdaUsd,
+        [EnumMember(Value = "ADA-BTC")]
+        AdaBtc,
+        [EnumMember(Value = "ADA-EUR")]
+        AdaEur,
+        [EnumMember(Value = "ADA-GBP")]
+        AdaGbp
     }
 }