Added boilerplate code for the new notifications library.

application/libraries/Notifications.php

@@ -0,0 +1,89 @@
+<?php
+
+/**
+ * Class Notifications
+ *
+ * This library handles all the notification email deliveries on the system.
+ *
+ * The email configuration settings are located at: /application/config/email.php
+ */
+class Notifications {
+    /**
+     * @var CI_Controller
+     */
+    private $framework;
+
+    /**
+     * Notifications constructor.
+     */
+    public function __construct()
+    {
+        $this->framework = &get_instance();
+    }
+
+    /**
+     * Send an email notification for an appointment confirmation.
+     *
+     * @param array $appointment
+     * @param array $service
+     * @param array $provider
+     * @param array $customer
+     * @param array $settings
+     * @param string $subject
+     * @param string $message
+     * @param string $link
+     * @param string $recipient
+     * @param string $ics
+     */
+    public function send_appointment_confirmation(
+        $appointment,
+        $service,
+        $provider,
+        $customer,
+        $settings,
+        $subject,
+        $message,
+        $link,
+        $recipient,
+        $ics
+    )
+    {
+        // TODO: Port logic from engine/Notifications/Email.php
+    }
+
+    /**
+     * Send an email notification for an appointment removal.
+     *
+     * @param array $appointment
+     * @param array $service
+     * @param array $provider
+     * @param array $customer
+     * @param array $settings
+     * @param string $recipient
+     * @param string $reason
+     */
+    public function send_appointment_removal(
+        $appointment,
+        $service,
+        $provider,
+        $customer,
+        $settings,
+        $recipient,
+        $reason
+    )
+    {
+        // TODO: Port logic from engine/Notifications/Email.php
+    }
+
+    /**
+     * Send an email notification with the new password, used when recovering an account.
+     *
+     * @param string $password
+     * @param string $recipient
+     * @param string $settings
+     */
+    public function send_new_password($password, $recipient, $settings)
+    {
+        // TODO: Port logic from engine/Notifications/Email.php
+    }
+}