add doc/dhcp-to-dns.md

doc/dhcp-to-dns.md

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+Create DNS records for DHCP leases
+==================================
+
+[◀ Go back to main README](../README.md)
+
+Description
+-----------
+
+This script adds (and removes) dns records based on dhcp server leases.
+
+Requirements and installation
+-----------------------------
+
+Just install the script:
+
+    $ScriptInstallUpdate dhcp-to-dns;
+
+Then run it from dhcp server as lease script. You may want to use
+[lease-script](lease-script.md).
+
+A scheduler cares about cleanup:
+
+    / system scheduler add interval=15m name=dhcp-to-dns on-event="/ system script run dhcp-to-dns;" start-time=startup;
+
+Configuration
+-------------
+
+The configuration goes to `global-config-overlay`, these are the parameters:
+
+* `Domain`: the domain used for dns records
+* `HostNameInZone`: whether or not to add the dhcp/dns server's hostname
+
+See also
+--------
+
+* [Collect MAC addresses in wireless access list](collect-wireless-mac.md)
+* [Comment DHCP leases with info from access list](dhcp-lease-comment.md)
+* [Run other scripts on DHCP lease](lease-script.md)
+
+---
+[◀ Go back to main README](../README.md)  
+[▲ Go back to top](#top)