Documentation about cupi HOT 3 OPEN

Cupi has two GRIO mods. First, it's direct access to GPIO registers over shared memory (super fast) but root is required. Second, over linux GPIO and sysfs interface (any user). We need to export pin to userland. You can read about this approach here.
Sorry for the lack of documentation.

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Thanks!
Do you want to keep the issue open just as a reminder to add more documentation? You can close it else.

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The link to the docs the readme should point to https://inre.github.io/cupi/cupi/index.html

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