added swift code

read_wfobj_from_pasteboard.swift

@@ -0,0 +1,10 @@
+import Cocoa
+
+let pasteboard = NSPasteboard.general
+let customType = NSPasteboard.PasteboardType(rawValue: "com.runningwithcrayons.alfred.workflow.editor.prefab")
+
+if let data = pasteboard.data(forType: customType) {
+    if let str = String(data: data, encoding: .utf8) {
+        print(str)
+    }
+}