docs: start migrating android build instructions to markdown
docs: start migrating android build instructions to markdown

This is the first part of what is found in
https://www.chromium.org/developers/how-tos/android-build-instructions

To convert the html page to markdown, pandoc tool was used. After having
it converted, it was manual changed while inspecting in http://dillinger.io.

The command lines ran were:

$ wget https://www.chromium.org/developers/how-tos/android-build-instructions
$ pandoc -s -r html android-build-instructions -o android_build_instructions.md

BUG=None
TEST=open android_build_instructions.md in a Markdown visualizer and
make sure it looks good.
R=dpranke@chromium.org,newt@chromium.org

Review URL: https://codereview.chromium.org/1862623002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#385238}

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