Update manage-calls-web.md

Author: sloanster

articles/communication-services/how-tos/calling-sdk/includes/manage-calls/manage-calls-web.md

@@ -365,3 +365,48 @@ Check is screen sharing is on. It returns `Boolean`.
 ```js
 const isScreenSharingOn = call.isScreenSharingOn;
 ```
+## Send or receive a reaction from other participants
+Within ACS you can send and receive reactions when on a group call:
+- Like :+1:
+- Love :heart:
+- Applause :clap:
+- Laugh :smile:
+- Surprise :open_mouth:
+
+To send a reaction you will use the `sendReaction(reactionMessage)` API. To receive a reaction message will be buit with Type `ReactionMessage` which uses `Reaction` enums as an attribute. 
+
+You will need to subscribe for events which provide the subscriber event data as:
+```javascript
+export interface ReactionEventPayload {
+    /**
+     * identifier for a participant
+     */
+    identifier: CommunicationUserIdentifier | MicrosoftTeamsUserIdentifier;
+    /**
+     * reaction type received
+     */
+    reactionMessage: ReactionMessage;
+}
+```
+
+You can determine which reaction is coming from which participant with `identifier` attribute and gets the reation type from `ReactionMessage`. 
+
+### Sample on how to send a reaction in a meeting
+```javascript
+const reaction = call.feature(SDK.Features.Reaction);
+const reactionMessage: SDK.ReactionMessage = {
+       reactionType: 'like'
+};
+await reaction.sendReaction(reactionMessage);
+```
+
+### Sample on how to receive a reaction in a meeting
+```javascript
+const reaction = call.feature(SDK.Features.Reaction);
+reaction.on('reaction', event => {
+    // user identifier
+    console.log("User Mri - " + event.identifier);
+   // reaction message
+   console.log("reaction message - " + JSON.stringify(event.reactionMessage));
+}
+```