newsletter service added

use OCP\IUserManager;

class NewsLetterService {

	/** @var IUserManager */

	private $userManager;

	/** @var IConfig */

	private $config;

	/** @var CurlService */

	private $curl;

	/** @var ILogger */

	private $logger;

	public function __construct($appName, IUserManager $userManager, IConfig $config, CurlService $curlService, ILogger $logger) {