readme: codetriage badge

README.md

@@ -9,6 +9,7 @@
 [![Build Status](https://travis-ci.com/frappe/erpnext.png)](https://travis-ci.com/frappe/erpnext) [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/frappe/erpnext?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
 [https://erpnext.com](https://erpnext.com)
+[![Open Source Helpers](https://www.codetriage.com/frappe/erpnext/badges/users.svg)](https://www.codetriage.com/frappe/erpnext)
 
 Includes: Accounting, Inventory, Manufacturing, CRM, Sales, Purchase, Project Management, HRMS. Requires MariaDB.