Add example config file to man page

Adds an example of config file contents to more clearly explain the
format to users unfamiliar with it. It's the same example as already
exists in the man page.

Author: sirlark

swayidle.1.scd

@@ -98,6 +98,16 @@ It will also lock your screen before your computer goes to sleep.
 To make sure swayidle waits for swaylock to lock the screen before it releases the
 inhibition lock, the *-w* options is used in swayidle, and *-f* in swaylock.
 
+The events can alternatively be put into a configuration file as follows:
+
+```
+timeout 300 'swaylock -f -c 000000'
+timeout 600 'swaymsg "output * power off"' resume 'swaymsg "output * power on"'
+before-sleep 'swaylock -f -c 000000'
+```
+
+If a default location is chosen, the swayidle instantiation is then simply `swayidle -w`.
+
 # AUTHORS
 
 Maintained by Drew DeVault <sir@cmpwn.com>, who is assisted by other open