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Added a new captcha(cloudflare turnstile) and its corresponding document. Cloudflare turnstile official instructions are here: https://developers.cloudflare.com/turnstile Signed-off-by: ByLCY <bylcy@bylcy.dev> Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com> Co-authored-by: Jason Song <i@wolfogre.com>