Add composing notification

Change-Id: I2c052c4395a56ba6acf882cea3be4b82e2fde761
diff --git a/common/src/enums/websocket-message-type.ts b/common/src/enums/websocket-message-type.ts
index 38d2042..37036b9 100644
--- a/common/src/enums/websocket-message-type.ts
+++ b/common/src/enums/websocket-message-type.ts
@@ -18,6 +18,8 @@
 export enum WebSocketMessageType {
   ConversationMessage = 'conversation-message',
   ConversationView = 'conversation-view',
+  OnComposingStatusChanged = 'on-composing-status-changed', // Sent by server to indicate who is composing a message or not
+  SetIsComposing = 'set-is-composing', // Sent by user to indicate whether they are composing a message or not
   CallBegin = 'call-begin',
   CallAccept = 'call-accept',
   CallEnd = 'call-end',