Update contribute guidelines
Update contribute guidelines

hglty07/fancytree,Koloto/fancytree,HobieCat/fancytree,Mats0/fancytree,Koloto/fancytree,hglty07/fancytree,hglty07/fancytree,HobieCat/fancytree,Koloto/fancytree,HobieCat/fancytree,Mats0/fancytree