Add API FAQ

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extra : rebase_source : 538e40184eb91b47aec48b8484c103c7895e5f65
fix faq script, ignore gradle/idea dirs

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extra : rebase_source : e66365a57f65fb28f6d10c156cdaddbed1ee7d04
i don't like to work for free FAQ

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extra : rebase_source : 8783d03e0fe7bb8e8e15f8efc9139866a6566e7e