GitLab

Start with a simple file adding pointers for further documentation of
`run_benchmark` command.

Follow up CLs can add on top by documenting other scripts in this
directory.

Bug: 922030
Change-Id: Ife3e22246746c416abf70ca0b0e92c2b51e2819d
Reviewed-on: https://chromium-review.googlesource.com/c/1489231Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635765}