Google Chrome Extension Development

Basically, the extension is a WhatsApp message sending extension.

Please refer to the below mentioned extension for more details:
https://chrome.google.com/webstore/detail/promote-route-for-whatsap/lgfomefmfkpdfhndeaaikffjbfobajbg

I need a new extension same as this with a different design and some additional things.
I will provide more details with candidated developer.
Thanks.