added Package.swift file

Author: Jovan Jovanovski

Package.swift

@@ -0,0 +1,17 @@
+// swift-tools-version:4.2
+
+import PackageDescription
+
+let package = Package(
+  name: "SwiftEventHandler",
+  products: [
+    .library(name: "SwiftEventHandler",
+             targets: ["SwiftEventHandler"])
+  ],
+  targets: [
+    .target(
+      name: "SwiftEventHandler",
+      path: "SwiftEventHandler"
+    )
+  ]
+)