ENGCOM-924: [2.3] Add a CodeTriage badge to magento/magento2 #1452

 - Merge Pull Request magento-engcom/magento2ce#1452 from magento-engcom/magento2ce:codetriage-badge-2.3
 - Merged commits:
   1. 80bd425

README.md

@@ -1,4 +1,5 @@
 [![Build Status](https://travis-ci.org/magento/magento2.svg?branch=2.3-develop)](https://travis-ci.org/magento/magento2)
+[![Open Source Helpers](https://www.codetriage.com/magento/magento2/badges/users.svg)](https://www.codetriage.com/magento/magento2)
 [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/magento/magento2?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
 [![Crowdin](https://d322cqt584bo4o.cloudfront.net/magento-2/localized.png)](https://crowdin.com/project/magento-2)
 <h2>Welcome</h2>