Created dnscheck (markdown)

dnscheck.md

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