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No change to code, only docs.

This adds device/emulator setup instructions. This recommends the
emulator, as it's publicly available and easy to setup. For physical
devices, this points to an Android site hosting publicly available
images (and directs Googlers to internal instructions).

This also documents how to build AOSP, but recommends against doing so.
The intent is to update
https://www.chromium.org/developers/how-tos/build-instructions-android-webview
to point to this page, so I've included this for completeness.

R=ctzsm@chromium.org

Bug: 918221
Test: tools/md_browser/md_browser.py
Test: Upload to gerrit > open file > click "gitiles"
Change-Id: I668171e9ed76a3af36429fc9218e4b236b4dd085
Reviewed-on: https://chromium-review.googlesource.com/c/1490407Reviewed-by: Shimi Zhang <ctzsm@chromium.org>
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636210}