Created dnssleep (markdown)

dnssleep.md

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+In dns mode, after the dns record is added, acme.sh will use cloudflare public dns or google dns to check if the record has taken effect.
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+If you don't want this check, please use --dnssleep 300.
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+acme.sh --issue -d xxxxx  --dns dns_xxx     --dnssleep 300
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+Then acme.sh will wait for 300 seconds instead of checking through the public dns.