Function markIsComposing

markIsComposing(chatId: string | Wid, duration?: number): Promise<void>
Mark a chat to composing state and keep sending "is writting a message"
Parameters
- chatId: string | Wid
- Optionalduration: number
Returns Promise<void>
Example
```
// Mark is composing
WPP.chat.markIsComposing('[number]@c.us');

// Mark is composing for 5 seconds
WPP.chat.markIsComposing('[number]@c.us', 5000);
```
- Defined in src/chat/functions/markIsComposing.ts:35