Update packageManager & add CryptoSwift

Package.swift

@@ -8,15 +8,16 @@ let package = Package(
     dependencies: [
         // Dependencies declare other packages that this package depends on.
         // .package(url: /* package url */, from: "1.0.0"),
+        .package(url: "https://github.com/krzyzanowskim/CryptoSwift.git", from: "1.0.0"),
     ],
     targets: [
         // Targets are the basic building blocks of a package. A target can define a module or a test suite.
         // Targets can depend on other targets in this package, and on products in packages which this package depends on.
         .target(
             name: "Blockchain",
-            dependencies: []),
+            dependencies: ["CryptoSwift"]),
         .testTarget(
             name: "BlockchainTests",
-            dependencies: ["Blockchain"]),
+            dependencies: ["Blockchain", "CryptoSwift"]),
     ]
 )