Adding Project API Class, and anothers classes to handle bpmn layer model

workflow/engine/src/ProcessMaker/Util/Logger.php

@@ -1,7 +1,13 @@
 <?php
-
 namespace ProcessMaker\Util;
 
+/**
+ * Singleton Class Logger
+ *
+ * This Utility is usefull to log local messages
+ * @package ProcessMaker\Util
+ * @author Erik Amaru Ortiz <aortiz.erik@gmail.com, erik@colosa.com>
+ */
 class Logger
 {
     private static $instance;