Cloning a existing Android app

We have a target to accomplish, we need to clone an app, i am not earning anything from this task, but i need to learn and it will be a great thing to do with guys.

We have to make a application which works with API's of railway to show PNR status, time table, routes, etc.

So, this is the existing app link: (https://play.google.com/store/apps/details?id=com.apphoard.trainmanager) , which we need to clone. Any person interested please RSVP to meet up.

Agenda: Meet and discuss, how it can be done. And you can carry a laptop if you want, i will carry mine.