Copy configs from infra/config branch. Also adds some documentation and updates OWNERS. Bug: 833848 Change-Id: I1e9adf9b84a776efceb5a529a73310f515e50c70 Reviewed-on: https://chromium-review.googlesource.com/c/1330681 Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>