* update progress of Vulkan back-end
* add link to creating a new bug
* add link to Vulkan presentation

Bug: angleproject:1944
Change-Id: Ib14df65df833f758a4ace325df28b8d4a52c1ced
Reviewed-on: https://chromium-review.googlesource.com/1065525Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>