A first pass at the documentation can be found here: 

https://docs.google.com/document/d/1ou6Dt2mxzXg7Mvi3LqHtejrZKRyklgN_Lhu0QiegkN0/edit?usp=sharing

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/docs/+/50ffb4b392294dd75fddcad9ff5ac566ad251ec4

commit 50ffb4b392294dd75fddcad9ff5ac566ad251ec4
Author: Caroline Tice <cmtice@google.com>
Date: Wed Apr 25 01:03:25 2018

Add user documentation for fuzz testing in Chrome OS.

BUG= chromium:821583 
TEST=Read document in browser.

Change-Id: If9265e09f4f7f1485ec0c9cb9d122ec5b8f3ebbf
Reviewed-on: https://chromium-review.googlesource.com/1015793
Commit-Ready: Caroline Tice <cmtice@chromium.org>
Tested-by: Caroline Tice <cmtice@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>

[add] https://crrev.com/50ffb4b392294dd75fddcad9ff5ac566ad251ec4/fuzzer-user-docs.md

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/docs/+/8bf78b15075129857b44f0862ac3294b7d13bd97

commit 8bf78b15075129857b44f0862ac3294b7d13bd97
Author: Manoj Gupta <manojgupta@google.com>
Date: Wed May 02 18:58:53 2018

doc: Update fuzzing docs.

Update some urls and add instructions to run build_packages
to build instructions.
BUG= chromium:821583 
TEST=Formatting look ok.

Change-Id: I458df786096e786507cbff7aca5630646d6b237b
Reviewed-on: https://chromium-review.googlesource.com/1040362
Reviewed-by: Caroline Tice <cmtice@chromium.org>
Commit-Queue: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Trybot-Ready: Manoj Gupta <manojgupta@chromium.org>

[modify] https://crrev.com/8bf78b15075129857b44f0862ac3294b7d13bd97/fuzzing.md

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/docs/+/1502d50e6d862cb202a68f565b8ad9289b94d769

commit 1502d50e6d862cb202a68f565b8ad9289b94d769
Author: Manoj Gupta <manojgupta@google.com>
Date: Tue May 08 23:46:58 2018

docs: Update fuzzing docs.

1. Add --skip_chroot_upgrade to build_packages. This will ensure that
host packages are not accidentally built with USE=asan/fuzzer.
2. Add a link to Chrome OS fuzzing setup doc.
3. Update platform + gyp package documentation related to compiling.
4. Update contact email to chromeos-fuzzing@.

BUG= chromium:821583 
TEST=Formatting look ok.

Change-Id: I3d1510fe6882f0a27229dde4def1a6d693aaeb7f
Reviewed-on: https://chromium-review.googlesource.com/1050566
Commit-Ready: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Caroline Tice <cmtice@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>

[modify] https://crrev.com/1502d50e6d862cb202a68f565b8ad9289b94d769/fuzzing.md