update porting-guidelines
update porting-guidelines

hughperkins/clnn,szagoruyko/clnn,brunoro/clnn,szagoruyko/clnn,brunoro/clnn,hughperkins/clnn,brunoro/clnn,szagoruyko/clnn,hughperkins/clnn,szagoruyko/clnn,brunoro/clnn,hughperkins/clnn