cri_vm: add note about virtualbox for mac users

Signed-off-by: James Landrein <james@cri.epita.fr>

docs/cri_vm.md

@@ -3,6 +3,9 @@
 This method allow you to have the PIE environment running in a VM on your
 computer.
 
+There exists two installation : Virtualbox and VMWare. Note that VirtualBox has
+shown numerous bugs on MacOS. VMWare is thus recommended for MacOS users.
+
 ## VirtualBox Installation
 
 ### First step