Merge pull request #131 from SushilMallRC/attachGitHubPage

Attach Github page link

README.md

@@ -2,13 +2,17 @@
 
 [![Build Status](https://github.com/ringcentral/ringcentral-php/workflows/CI%20Pipeline/badge.svg?branch=master)](https://github.com/ringcentral/ringcentral-php/actions)
 [![Coverage Status](https://coveralls.io/repos/ringcentral/ringcentral-php/badge.svg?branch=master&service=github)](https://coveralls.io/github/ringcentral/ringcentral-php?branch=master)
+[![Code Document](https://img.shields.io/badge/phpdoc-reference-blue?branch=master&service=github)](https://ringcentral.github.io/ringcentral-php/)
 [![Chat](https://img.shields.io/badge/chat-on%20glip-orange.svg)](https://glipped.herokuapp.com/)
 [![Twitter](https://img.shields.io/twitter/follow/ringcentraldevs.svg?style=social&label=follow)](https://twitter.com/RingCentralDevs)
 
 __[RingCentral Developers](https://developer.ringcentral.com/api-products)__ is a cloud communications platform which can be accessed via more than 70 APIs. The platform's main capabilities include technologies that enable:
 __[Voice](https://developer.ringcentral.com/api-products/voice), [SMS/MMS](https://developer.ringcentral.com/api-products/sms), [Fax](https://developer.ringcentral.com/api-products/fax), [Glip Team Messaging](https://developer.ringcentral.com/api-products/team-messaging), [Data and Configurations](https://developer.ringcentral.com/api-products/configuration)__.
 
-[API Reference](https://developer.ringcentral.com/api-docs/latest/index.html) and [APIs Explorer](https://developer.ringcentral.com/api-explorer/latest/index.html).
+## Additional resources
+
+* [RingCentral API Reference](https://developer.ringcentral.com/api-docs/latest/index.html) - an interactive reference for the RingCentral API that allows developers to make API calls with no code.
+* [Document](https://ringcentral.github.io/ringcentral-php/) - an interactive reference for the SDK code documentation.
 
 # Requirements