Add CryptoAddressValidator

Trust/Foundation/CryptoAddressValidator.swift

@@ -0,0 +1,16 @@
+// Copyright SIX DAY LLC. All rights reserved.
+
+import Foundation
+
+enum AddressValidatorType {
+    case ethereum
+}
+
+struct CryptoAddressValidator {
+    static func isValidAddress(_ value: String?, type: AddressValidatorType = .ethereum) -> Bool {
+        guard value?.count == 42 else {
+            return false
+        }
+        return true
+    }
+}