Transforming into a composer package class

As I should use this into more than one project, it would be better to
turn it into a composer package. So I learn how to do that and use it at
work at the same time.

src/auth.php

@@ -0,0 +1,34 @@
+<?php
+/**
+ * A very compact and simple Memsource API library
+ * 
+ * @author Bruno Fontes <developer@brunofontes.net>
+ * @link   https://github.com/brunofontes
+ */
+namespace BrunoFontes\Memsource;
+
+class Auth
+{
+    protected $base_url;
+    private $_client_id;
+    private $_client_secret;
+    
+    function __construct(string $base_url)
+    {
+        $this->base_url = $base_url;
+    }
+
+    /**
+     * Directly login and get a token valid for 24h
+     *
+     * @param string $username Memsource username
+     * @param string $password Memsource password
+     * 
+     * @return string Authorization code valid for 24h only
+     */
+    function login(string $username, string $password)
+    {
+        $authorize_url = $this->base_url . '/oauth/authorize';
+        return $authorize_url . '?response_type=code&client_id=' . $client_id . '&redirect_uri=' . $callback_uri . '&scope=openid';
+    }
+}