Update README.md

Author: famous90

README.md

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 ## Introduction
 `SendBird Calls` is the latest addition to our product portfolio. It enables real-time calls between users within a SendBird application. SDKs are provided for iOS, Android, and JavaScript. Using any one of these, developers can quickly integrate voice and video call functions into their own client apps, allowing users to make and receive web-based real-time voice and video calls on the SendBird platform.
 
+> If you need any helps or have any issue / question, please visit [our community](https://community.sendbird.com) 
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 ## Functional Overview
 The SendBird Calls JavaScript SDK provides a framework to make and receive voice and video calls. “Direct calls” in the SDK refers to one-to-one calls, comparable to “direct messages” (DMs) in messaging services. To make a direct voice or video call, the caller specifies the user ID of the intended callee, and dials. Upon dialing, all of the callee’s authenticated devices will receive incoming call notifications. The callee then can choose to accept the call from any one of the devices. When the call is accepted, a connection is established between the caller and the callee. This marks the start of the direct call. Call participants may mute themselves, as well as select the audio and video hardware used in the call. Calls may be ended by either party. The SendBird Dashboard displays call logs in the Calls menu for application owners and admins to review.