Adds a gradle build for documentation testing, partially stolen from the xpack meta repo. Updated to make work with the current setup
index.asciidoc was updated/enabled as a test, and various pre-existing tests appear to be working. There are a large number of tests still ignored due to missing proper // CONSOLE tags
Original commit: elastic/x-pack-elasticsearch@1d596f0be3
* [DOCS] First draft of ML getting started tutorial
* [DOCS] More ML getting started content
* [DOCS] Getting started content for data feeds
* [DOCS] Added ML getting started screenshot
Original commit: elastic/x-pack-elasticsearch@73174d27e8
Zachary Tong
Lisa Cawley
debadair