add spiral example gcode

Utils/spiral.gcode

@@ -0,0 +1,51 @@
+%
+(Header)
+(Generated by gcodetools from Inkscape.)
+(Using default header. To add your own header create file "header" in the output dir.)
+M3
+(Header end.)
+G21 (All units in mm)
+
+(Start cutting path id: path79)
+(Change tool to Cylindrical cutter)
+
+G00 Z5.000000
+G00 X26.458332 Y26.836296
+
+G01 Z-1.000000 F100.0(Penetrate)
+G01 X27.060904 Y25.800445 Z-1.000000 F400.000000
+G01 X26.279822 Y24.979425 Z-1.000000
+G01 X23.928150 Y25.241403 Z-1.000000
+G01 X22.744584 Y27.193315 Z-1.000000
+G01 X23.733695 Y30.767662 Z-1.000000
+G01 X26.993863 Y32.406926 Z-1.000000
+G01 X31.809940 Y30.724710 Z-1.000000
+G01 X33.885827 Y26.122256 Z-1.000000
+G01 X31.521283 Y20.056561 Z-1.000000
+G01 X25.565780 Y17.551925 Z-1.000000
+G01 X18.246633 Y20.594124 Z-1.000000
+G01 X15.317089 Y27.907365 Z-1.000000
+G01 X19.034511 Y36.482112 Z-1.000000
+G01 X27.707905 Y39.834417 Z-1.000000
+G01 X37.539583 Y35.443216 Z-1.000000
+G01 X41.313322 Y25.408217 Z-1.000000
+G01 X36.249207 Y14.318751 Z-1.000000
+G01 X24.851738 Y10.124434 Z-1.000000
+G01 X12.503884 Y15.860834 Z-1.000000
+G01 X7.889594 Y28.621404 Z-1.000000
+G01 X14.297845 Y42.228083 Z-1.000000
+G01 X28.421947 Y47.261918 Z-1.000000
+G01 X43.074354 Y40.418698 Z-1.000000
+G01 X48.758928 Y25.324408 Z-1.000000
+G00 Z5.000000
+
+(End cutting path id: path79)
+
+
+(Footer)
+M5
+G00 X0.0000 Y0.0000
+M2
+(Using default footer. To add your own footer create file "footer" in the output dir.)
+(end)
+%