GitLab

Add README for //net/cookies

Based partially on earlier draft by morlovich:
https://crrev.com/c/1038245

Bug: None
Change-Id: I98ad46c6b3ed83d2af5ad9a565008829cf5cdba3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2284134
Commit-Queue: Lily Chen <chlily@chromium.org>
Reviewed-by: Steven Bingler <bingler@chromium.org>
Reviewed-by: Maksim Orlovich <morlovich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786309}