iccjpeg: Add README with license information.

Make source files refer to README for license details.
Covered by same copyright and license as libjpeg.

BUG=98137
TESTED=tools/checklicenses/checklicenses.py --ignore-suppressions third_party/iccjpeg/
R=brettw@chromium.org

Review-Url: https://codereview.chromium.org/2182993003
Cr-Commit-Position: refs/heads/master@{#409600}
5 files changed