resolvconf: add page (#10780)

* Adding page for resolvconf command

* Added trailing newline that was causing test failure

* Added additional information on the command.

* Added additional information on the command.

* Removed the postconf file.

* addressed comments

pages/common/resolvconf.md

@@ -0,0 +1,30 @@
+# resolvconf
+
+> Manage nameserver information.
+> Acts as an intermediary between programs that supply nameserver information and applications that use this information.
+> This tldr documents Debian's implementation of resolvconf.
+> More information: <https://manpages.ubuntu.com/manpages/resolvconf.8.html>.
+
+- Add or override the IFACE.PROG record and run the update scripts if updating is enabled:
+
+`resolvconf -a {{IFACE.PROG}}`
+
+- Delete the IFACE.PROG record and run the update scripts if updating is enabled:
+
+`resolvconf -d {{IFACR.PROG}}`
+
+- Just run the update scripts if updating is enabled:
+
+`resolvconf -u`
+
+- Set the flag indicating whether `resolvconf` should run update scripts when invoked with `-a`, `-d` or `-u`:
+
+`resolvconf --enable-updates`
+
+- Clear the flag indicating whether to run updates:
+
+`resolvconf --disable-updates`
+
+- Check whether updates are enabled:
+
+`resolvconf --updates-are-enabled`