add system-nvidia-smi (close #42)

polybar-scripts/system-nvidia-smi/README.md

@@ -0,0 +1,18 @@
+# Script: system-nvidia-smi
+
+A script that shows the NVIDIA GPU consumption.
+
+
+## Dependencies
+
+* `nvidia-smi`
+
+
+## Module
+
+```ini
+[module/system-nvidia-smi]
+type = custom/script
+exec = ~/polybar-scripts/system-nvidia-smi.sh
+tail = true
+```

polybar-scripts/system-nvidia-smi/system-nvidia-smi.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+nvidia-smi --loop=10 --query-gpu=utilization.gpu --format=csv,noheader,nounits | awk '{ print "# $1 %" }'