Add dns section, redirect to awesome-sysadmin (#554)

fixes #548

README.md

@@ -33,6 +33,7 @@ See [Contributing](#contributing).
       - [XMPP Web Clients](#xmpp-web-clients)
   - [Content Management Systems (CMS)](#content-management-systems-cms)
     - [E-commerce](#e-commerce)
+  - [DNS](#dns)
   - [Document Archiving](#document-archiving)
   - [Enterprise Resource Planning](#enterprise-resource-planning)
   - [Federated Identity/Authentication](#federated-identityauthentication)
@@ -397,6 +398,10 @@ _Recipe management_
 * [WooCommerce](https://www.woothemes.com/woocommerce/) - WordPress based e-commerce solution. ([Source Code](https://github.com/woothemes/woocommerce)) `GPL` `PHP`
 
 
+## DNS
+
+See https://github.com/n1trux/awesome-sysadmin#dns
+
 ## Document Archiving
 
   * [CUPS](https://www.cups.org/) - The Common Unix Print System uses Internet Printing Protocol (IPP) to support printing to local and network printers. ([Source Code](https://www.cups.org/software.php)) `GPLv2` `C`