Add a README to the project

Author: Nana Axel

README.md

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+# :fire: FireFS
+
+Manage your file system easily, through php
+
+**FireFS** is a library allowing you to write/read/delete files and folders of your file system, safely and easily.
+
+It can be used for *web* applications as well for *console* applications, without any requirements.
+
+## Example
+
+```php
+<?php
+
+use ElementaryFramework\FireFS\FireFS;
+
+// Create a new file system instance at the given path
+$fs = new FireFS("./app"); // /root/var/www/htdocs/app/
+
+// Check if the path "/root/var/www/htdocs/app/images/" exists
+if ($fs->exists("images")) {
+    // Change the working directory to the images folder
+    $fs->setWorkingDirectory("./images");
+
+    // Create a new file in the working directory
+    $fs->mkfile("./logo.png"); // /root/var/www/htdocs/app/images/logo.png
+
+    // Read file from the file system root path
+    $logo = $fs->read("logo.png"); // /root/var/www/htdocs/app/logo.png
+
+    // Write into the created file
+    $fs->write("./logo.png", $logo); // /root/var/www/htdocs/app/images/logo.png
+
+    // Delete the old file
+    $fs->delete("logo.png"); // /root/var/www/htdocs/app/logo.png
+}
+
+// Change the working directory to the file system root path
+$fs->setWorkingDirectory("./");
+
+// Create a "blog" directory
+$fs->mkdir("blog"); // /root/var/www/htdocs/app/blog/
+
+// Move "images" folder from "app" to "app/blog"
+$fs->move("images", "blog/images");
+
+// And more !
+```
+
+## Features
+
+- Easy file system management ;
+- Object Oriented file system entities management, through [Folder](https://github.com/ElementaryFramework/FireFS/blob/master/src/FireFS/Entities/Folder.php) and [File](https://github.com/ElementaryFramework/FireFS/blob/master/src/FireFS/Entities/File.php) classes ;
+- Receive events of what happen to your file system (created, modified, deleted events) and execute a specific action with the [file system listener](https://github.com/ElementaryFramework/FireFS/blob/master/src/FireFS/Listener/IFileSystemListener.php) ;
+- Run a [file system watcher](https://github.com/ElementaryFramework/FireFS/blob/master/src/FireFS/Watcher/FileSystemWatcher.php) to watch for files changes in **real time** (recommended for console applications)
+
+## Installation
+
+You can install **FireFS** in your project with [composer](http://getcomposer.org):
+
+```sh
+composer require elementaryframework/fire-fs
+```
+
+Once installed, you can access the **FireFS** api through the `ElementaryFramework\FireFS` namespace.
+
+## How to use
+
+New to **FireFS** ? From console to web apps, you can read the [wiki](https://github.com/ElementaryFramework/FireFS/wiki) to know how to use this
+library into your project.
+
+## License
+
+&copy; 2018 Aliens Group, Inc.
+
+Licensed under MIT ([read license](https://github.com/ElementaryFramework/FireFS/blob/master/LICENSE)).