Red

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I would say every user gets the badge, but then if someone only added one line, then they'd get the badge anyway.... Hmm, that would be an interesting topic of thought.

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Maybe.... but I don't know where that would fit :P

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@Yatrik: There will be a GUI for adding people you would like to credit, in the settings panel where the canvas size changers are right now.

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Here is some sample code I made: https://www.khanacademy.org/computer-programming/an-idea/4854278986792960

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@Eytukan: good point. I would suggest that as well.