docs: add first version of CATS docs

Signed-off-by: Bartosz Golaszewski brgl@bgdev.pl

requested review from @pidge

mentioned in issue eclipse/oniro-core/docs#6 (closed)

mentioned in issue eclipse/oniro-core/docs#103

mentioned in issue eclipse/oniro-core/docs#104 (closed)

requested review from @agherzan

@brgl I had requested access for this repo, still not provided, I am not getting how to review the docs here.

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