meta: Add swayidle

This lets us automatically start swaylock on lid close, useful when on
the go, although not a replacement for turning off a computer fully.

sway/.config/sway/config

@@ -178,4 +178,7 @@ bindsym XF86MonBrightnessUp exec brightnessctl set +5%
 # bindsym XF86WLAN exec
 # bindsym XF86Favorites exec
 
+# Lock the screen after a certain amount of time
+exec swayidle -w
+
 include /etc/sway/config.d/*

swayidle/.config/swayidle/config

@@ -0,0 +1,2 @@
+timeout 300 swaylock
+before-sleep swaylock

swayidle/README.md

@@ -0,0 +1,16 @@
+# swayidle
+
+[swayidle][swayidle] is an idle management daemon for Wayland.
+
+## Use Cases
+
+swayidle can be used to:
+
+- Automatically lock the screen after a period of inactivity
+- Automatically lock the screen on lid close (e.g. on a laptop)
+
+You should not use swayidle if:
+
+- You don't want to automatically lock the screen.
+
+[swayidle]: https://github.com/swaywm/swayidle