Make swift pm project

Package.swift

@@ -0,0 +1,16 @@
+// swift-tools-version:5.2
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+  name: "KeychainKit",
+  platforms: [.iOS(.v8)],
+  products: [
+    .library(name: "KeychainKit", targets: ["KeychainKit"]),
+  ],
+  dependencies: [],
+  targets: [
+    .target(name: "KeychainKit", dependencies: [])
+  ]
+)