8196298: Add null Reader and Writer
Reviewed-by: bpb, forax, smarks, alanb, rriggs
Contributed-by: patrick@reini.net
^build/
^dist/
^.idea/
nbproject/private/
^webrev
^.src-rev$
^.jib/
\.DS_Store
\.metadata/
\.recommenders/
test/nashorn/script/external
test/nashorn/lib
NashornProfile.txt
.*/JTreport/.*
.*/JTwork/.*