CustomUserAction1.ps1

Add-Type -Path "c:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\ISAPI\Microsoft.SharePoint.Client.dll" 
Add-Type -Path "c:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\ISAPI\Microsoft.SharePoint.Client.Runtime.dll"
Add-Type -Path "c:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\ISAPI\Microsoft.SharePoint.Client.Publishing.dll"

# Authenticate with the SharePoint site. 
# 
$siteUrl = Read-Host -Prompt "Enter web url:" 
$username = Read-Host -Prompt "Enter Username:" 
$password = Read-Host -Prompt "Enter password" -AsSecureString 
$ctx = New-Object Microsoft.SharePoint.Client.ClientContext($siteUrl) 

# SharePoint Online
$credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($username, $password) 
$ctx.Credentials = $credentials