Update README.

Author: Maikuolan

README.md

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+[![Join the chat at https://gitter.im/phpMussel2/Lobby](https://badges.gitter.im/phpMussel2/Lobby.svg)](https://gitter.im/phpMussel2/Lobby)
+[![v1: PHP >= 5.4.0](https://img.shields.io/badge/v1-PHP%20%3E%3D%205.4.0-8892bf.svg)](https://maikuolan.github.io/Compatibility-Charts/)
+[![v2~v3: PHP >= 7.2.0](https://img.shields.io/badge/v2%7Ev3-PHP%20%3E%3D%207.2.0-8892bf.svg)](https://maikuolan.github.io/Compatibility-Charts/)
+[![License: GPL v2](https://img.shields.io/badge/License-GPL%20v2-blue.svg)](https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html)
+[![PRs Welcome](https://img.shields.io/badge/PRs-Welcome-brightgreen.svg)](http://makeapullrequest.com)
+
+## **What is phpMussel?**
+
+An ideal solution for shared hosting environments, where it's often not possible to utilise or install conventional anti-virus protection solutions, phpMussel is a PHP script designed to **detect trojans, viruses, malware and other threats** within files uploaded to your system wherever the script is hooked, based on the signatures of [ClamAV](https://www.clamav.net/) and others. For information regarding *HOW TO INSTALL* {2A+2B} and *HOW TO USE* {3A+3B} phpMussel, please refer either to the [Wiki](https://github.com/phpMussel/phpMussel/wiki) or to the [documentation](https://github.com/phpMussel/Docs/tree/master) (direct links to that documentation included under the "Documentation" header below this paragraph).
+
+---
+
+
+### What's this repository for?
+
+This provides a bridge between phpMussel and PHPMailer, enabling phpMussel to utilise PHPMailer for two-factor authentication, email notification about blocked file uploads, etc.
+
+```
+composer require phpmussel/phpmailer
+```
+
+__*Example:*__
+```PHP
+<?php
+// Path to vendor directory.
+$Vendor = __DIR__ . DIRECTORY_SEPARATOR . 'vendor';
+
+// Composer's autoloader.
+require $Vendor . DIRECTORY_SEPARATOR . 'autoload.php';
+
+$Loader = new \phpMussel\Core\Loader();
+$Scanner = new \phpMussel\Core\Scanner($Loader);
+$FrontEnd = new \phpMussel\FrontEnd\FrontEnd($Loader, $Scanner);
+$Web = new \phpMussel\Web\Web($Loader, $Scanner);
+$Loader->Events->addHandler('sendMail', new \phpMussel\PHPMailer\Linker($Loader));
+
+$Web->scan();
+$FrontEnd->view();
+
+unset($Web, $FrontEnd, $Scanner, $Loader);
+```
+
+#### See also:
+- [phpMussel/phpMussel](https://github.com/phpMussel/phpMussel) – The main phpMussel repository (you can get phpMussel versions prior to v3 from here).
+- [phpMussel/Core](https://github.com/phpMussel/Core) – phpMussel core (dedicated Composer version).
+- [phpMussel/CLI](https://github.com/phpMussel/CLI) – phpMussel CLI-mode (dedicated Composer version).
+- [phpMussel/FrontEnd](https://github.com/phpMussel/FrontEnd) – phpMussel front-end (dedicated Composer version).
+- [phpMussel/Web](https://github.com/phpMussel/Web) – phpMussel upload handler (dedicated Composer version).
+- [phpMussel/Examples](https://github.com/phpMussel/Examples) – Prebuilt examples for phpMussel (useful for users which don't want to use Composer to install phpMussel).
+- [phpMussel/plugin-boilerplates](https://github.com/phpMussel/plugin-boilerplates) – This repository contains boilerplate code which can be used to create new plugins for phpMussel.
+- [phpMussel/Plugin-PHPMailer](https://github.com/phpMussel/Plugin-PHPMailer) – Provides 2FA and email notifications support for phpMussel v3+.
+
+---
+
+
+Last Updated: 6 July 2020 (2020.07.06).