Add function to check battery percentage.

files/dwm/battery.function

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+function battery {
+	upower -i /org/freedesktop/UPower/devices/battery_BAT0 | grep percentage | grep -o "[0-9.%]*"
+}
+alias show-battery="battery"
+alias battery-display="battery"