Added the script used to compare performance.

experiments/speed/run.sh

@@ -0,0 +1,2 @@
+#!/bin/sh
+time perl test.pl

experiments/speed/test.pl

@@ -0,0 +1,4 @@
+for ($i=0; $i<100; $i++)
+   {
+    system("src/kiplot -b tests/board_samples/good-project.kicad_pcb -c tests/yaml_samples/simple_position_csv.kiplot.yaml -d pp");
+   }