Create content/services/auction_worklet/ directory

Sets up this directory with a README and OWNERS.
Creating this directory was discussed at:
https://groups.google.com/a/chromium.org/g/services-dev/c/NSNfifasvII/m/HXnhcqEZBQAJ

Bug: 1186444
Change-Id: I527f8d56baef94e8d92638672658c49f3b3cd349
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2792641
Commit-Queue: Paul Jensen <pauljensen@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#868612}

content/services/auction_worklet/OWNERS

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+caraitto@chromium.org
+mmenke@chromium.org
+morlovich@chromium.org
+pauljensen@chromium.org

content/services/auction_worklet/README.md

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+# Auction Worklet Service
+
+A central part of [FLEDGE](https://github.com/WICG/turtledove/blob/main/FLEDGE.md)'s
+[running of on-device ad auctions](https://github.com/WICG/turtledove/blob/main/FLEDGE.md#2-sellers-run-on-device-auctions)
+is the execution of
+[bidding](https://github.com/WICG/turtledove/blob/main/FLEDGE.md#32-on-device-bidding)
+and
+[bid scoring](https://github.com/WICG/turtledove/blob/main/FLEDGE.md#23-scoring-bids)
+worklets. These worklets execute JavaScript functions that do not have access to
+networking, storage, or any other part of a web page (e.g. DOM).  Due to the
+execution of downloaded code and these isolation requirements they're run in
+a separate process.  The Auction Worklet Service orchestrates and controls the
+execution of these auction worklets.

content/services/auction_worklet/public/mojom/OWNERS

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+per-file *.mojom=set noparent
+per-file *.mojom=file://ipc/SECURITY_OWNERS