add maintenance script

check-gerbers.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+# see if gerbers need updating before commit
+
+for i in `find -type d -name fabrication | sed "s/\/fabrication//;s/.\///"`
+do 
+  if [ $i/$i.kicad_pcb -nt $i/fabrication/$i-F_Cu.gbr ]
+  then 
+    echo $i: update gerbers
+  fi
+done