Extend contributing.md
Extend contributing.md

achanda/redox,vvlevchenko/redox,achanda/redox,skylerberg/redox,nounoursheureux/redox,vvlevchenko/redox,skylerberg/redox,imp/redox,stryan/redox,tedsta/redox,nxnfufunezn/redox,bheesham/redox,stryan/redox,nxnfufunezn/redox,imp/redox,stryan/redox,tedsta/redox,imp/redox,bheesham/redox,nounoursheureux/redox,nxnfufunezn/redox,tedsta/redox,bheesham/redox,skylerberg/redox,tedsta/redox,achanda/redox,stryan/redox,skylerberg/redox,vvlevchenko/redox,bheesham/redox,nounoursheureux/redox