Added a mute-unmute script and binding to alt+mute key

scripts/mute-unmute.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+if [ $(pamixer --get-mute) = false ]; then
+spd-say -Cw 'muting'
+pamixer -t
+else
+pamixer -t
+spd-say -Cw 'unmuted'
+fi