README added

README.md

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+# Simple PulseAudio volume monitor
+
+This little monitor is my attempt to read the current volume and mute setting
+of the default sink from PulseAudio and make it accessible to xmobar:
+
+```haskell
+Config { commands = [
+                    , Run CommandReader "puvol-cont" "Vol"
+                    ]
+       , template = "%XMonadLog% }{ \
+           \│ <action=`alacritty -t pamix -e pamix` button=1>%Vol%</action> \
+           \│ %date% "
+```
+
+If it is called as `puvol-cont` it will wait for updates form PulseAudio, read
+the current value of the mute and volume states and write an output line to
+stdout.
+
+## Installation
+
+```shell
+go install kesim.org/puvol
+```
+
+For the continous mode you have to copy or add an symbolic link with name `puvol-cont`:
+
+```shell
+cd /path/to/bin/dir
+ln -s puvol puvol-cont
+```