Add share Button to Unity Game

Hello Friends, I have been making some android and iPhone games, And At the very last moment of their completion i am stuck with the SHARE button, I want to have a share button in my apps which can take the screenshot of screen and Can share it with a text embedded . I need scripts which can do it for both Android and iOS inside Unity. Please let me know if you can do this. You will have to show me that the scripts are working through teamviewer or something and You should have the rights to sell that code . Happy Bidding !