Add links for K40 machine

K40.md

@@ -12,8 +12,22 @@ dateCreated: 2021-09-21T09:35:07.364Z
 
 ## Guides
 
+- http://lellep.xyz/blog/my-small-hobby-laser-cutter.html
+- https://www.civade.com/post/2020/08/23/D%C3%A9coupe-laser-CO2-K40-Am%C3%A9liorations-/-hacking-de-la-machine
+- https://www.decoupeuse-laser.com/2020/02/07/avis-laser-40w-co2-k40/
+
+## Controller
+
+- https://awesome.tech/product/mini-gerbil-2-axis-controller-for-k40-laser-cutter/
+- https://buildbotics.com/product/113/buildbotics-cnc-controller
+- https://awesome.tech/product/mini-gerbil-2-axis-controller-for-k40-laser-cutter-pro-pack/
+
+## Software
+
+- https://www.scorchworks.com/K40whisperer/k40whisperer.html
+- https://lightburnsoftware.com/collections/frontpage/products/lightburn-gcode
+
 ## Buys parts
 
 ## Build log
 
-modif bis