Added docs

Author: p3nt4

documentation/modules/post/windows/manage/run_as_psh.md

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+## Overview
+This module will start a process as another user using powershell.
+By default, it will start an interactive cmd as the target user.
+
+## Module Options
+- **USER** - The use to run the program as. 
+- **PASS** - The user's password  
+- **DOMAIN** - The domain of the user
+- **EXE** - The program to run (default cmd.exe)
+- **PASS** - The program arguments 
+- **PATH** - The path to run the program in (default C:\)
+- **CHANNELIZE** - Channelize the output, required to read output or interact
+- **INTERACT** - Interact with program
+- **HIDDEN** - Hide the console window
+
+## Module Process
+The process will use the Start-Process command of powershell to run a process as another user.
+## Limitations
+- Requires Powershell
+- Hidden Mode does not work with older powershell versions
+- Interactive mode needs to be ran from a meterpreter console
+
+## Examples
+
+`
+meterpreter > getuid
+Server username: NT AUTHORITY\SYSTEM
+meterpreter > run post/windows/manage/run_as_psh user=test pass=mypassword
+
+[*] Hidden mode may not work on older powershell versions, if it fails, try HIDDEN=false
+[*] Process 1672 created.
+[*] Channel 30 created.
+Microsoft Windows [Version 10.0.14393]
+(c) 2016 Microsoft Corporation. All rights reserved.
+
+C:\>whoami
+whoami
+my-pc\test
+
+C:\>
+
+meterpreter > run post/windows/manage/run_as_psh user=test pass=mypassword hidden=false channelize=false interactive=false exe=cmd path=C:\\windows args="/c start notepad"
+
+[*] Process 9768 created.
+meterpreter > 
+
+`