minor: create readme file

jinrenjie · jinrenjie · commit 3975c303f027 · 2024-07-17T03:12:26.000+08:00
diff --git a/README.md b/README.md
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+# CDNS
+
+An open-source lightweight DNS server that switches to ACME DNS challenge.

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	`1`	`+# CDNS`
	`2`	`+`
	`3`	`+An open-source lightweight DNS server that switches to ACME DNS challenge.`