Add generic authorization class

app/Core/Security/Role.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Kanboard\Core\Security;
+
+/**
+ * Role Definitions
+ *
+ * @package  security
+ * @author   Frederic Guillot
+ */
+class Role
+{
+    const APP_ADMIN       = 'app-admin';
+    const APP_MANAGER     = 'app-manager';
+    const APP_USER        = 'app-user';
+    const APP_PUBLIC      = 'app-public';
+
+    const PROJECT_MANAGER = 'project-manager';
+    const PROJECT_MEMBER  = 'project-member';
+    const PROJECT_VIEWER  = 'project-viewer';
+}