Adding rate button in my game?

Hello friends I want to add a button in my game, so that if user clicks on that button, he should rate my game and it should work on android and i-phone as well.

One that works for both is not possible as they have distinct marketplaces.

But there are easy systems for both of them. For iOS I would recommend to look at appirater, a free opensource piece of code that can be found at GitHub - arashpayan/appirater: A utility that reminds your iPhone app's users to review the app. to do exactly this (its the code behind most of those ‘please rate this’ popups you might know :))