Usage-of-the-Mailer-service-(SwiftMailer).md

+We have implemented SwiftMailer for you in this codebase. To use it, you may refer to this example.
+
+```` php
+
+// As an example we can use the Mailer service in a Controller.
+// We can inject the service from the class Constructor.
+class HelloController
+{
+    /**
+     * @var Swift_Mailer
+     */
+    protected $mailer;
+
+    /**
+     * @param Swift_Mailer $mailer
+     */
+    public function __construct(Swift_Mailer $mailer)
+    {
+        $this->mailer = $mailer;
+    }
+}
+
+// Then we can just call the Mailer from any Controller method.
+$message = (new Swift_Message('Hello from PHP Challenge'))
+    ->setFrom(['phpchallenge@jobsity.io' => 'PHP Challenge'])
+    ->setTo(['user@domain.org'])
+    ->setBody('SwiftMailer is awesome!.');
+
+// Later just do the actual email sending.
+$this->mailer->send($message);
+````
+
+For more information about SwiftMailer, please visit:
+
+https://swiftmailer.symfony.com/docs/introduction.html
+
+For additional information about the Dependency Container,
+please refer to:
+
+https://www.slimframework.com/docs/v4/concepts/di.html
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