index.md: Add section about usage of Arm Clang bucket

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I994e496f8e5d09a4c90c1fda4883059f06cded74
1 file changed
tree: 2acdb46206cc14f3128905d057a181232cd27275
  1. docs/
  2. .gitreview
  3. mkdocs.yml
  4. requirements.txt