[DOCS] Drafts index.asciidoc for ML Guide (#734)

Author: lcawl

docs/en/stack/ml/get-started-trial.asciidoc

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+By default, when you install {stack} products, they apply basic licenses with no 
+expiration dates. To view your license in {kib}, go to **Management** and click 
+**License Management**.
+
+[role="screenshot"]
+image::images/management-license.png["The License Management page in {kib}"]
+
+For more information about Elastic license levels, see 
+https://www.elastic.co/subscriptions.
+
+You can start a 30-day trial to try out all of the platinum features, including 
+{ml-features}. Click **Start trial** on the **License Management** page in {kib}.
+
+IMPORTANT: If your cluster has already activated a trial license for the current 
+major version, you cannot start a new trial. For example, if you have already 
+activated a trial for v6.0, you cannot start a new trial until v7.0.
+
+At the end of the trial period, the platinum features operate in a 
+{stack-ov}/license-expiration.html[degraded mode]. You can revert to a basic license, extend 
+the trial, or purchase a subscription. 

docs/en/stack/ml/images/management-license.png

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+= Machine Learning in the Elastic Stack
+
+:doctype:           book
+:forum:             https://discuss.elastic.co/c/x-pack
+:blog-ref:          https://www.elastic.co/blog/
+:wikipedia:         https://en.wikipedia.org/wiki
+:es-repo-dir:       {docdir}/../../../../../elasticsearch/docs/reference
+:stack-repo-dir:    {docdir}
+include::{asciidoc-dir}/../../shared/versions/stack/{source_branch}.asciidoc[]
+include::{asciidoc-dir}/../../shared/attributes.asciidoc[]
+
+include::anomaly-detection/index.asciidoc[]
+
+include::df-analytics/index.asciidoc[]