After adding the attribute noted by @AlxGr you need to copy the file modules/Project/Menu.php into custom folder and then add the content:
if (ACLController::checkAccess('Project', 'import', true)) {
$module_menu[]=array("index.php?module=Import&action=Step1&import_module=Project&return_module=Project&return_action=index", $mod_strings['LBL_IMPORT'],"Import", 'Project');
}
Run Quick Repair and Build before testing.
Regards