documentation on how to create new Add Data tutorials. (elastic#16257) (

elastic#16326)

* tutorial docs

* fixes from ycombinator review

* ElasticSearch -> Elasticsearch

* move out of style guide and into README under server/tutorials

* move to asciidocs

* add new line so list is rendered correctly

* changes from gchaps review

docs/development/add-data-guide.asciidoc

@@ -0,0 +1,34 @@
+[[add-data-guide]]
+== Add Data Guide
+
+`Add Data` in the Kibana Home application contains tutorials for setting up data flows in the Elastic stack.
+
+Each tutorial contains three sets of instructions:
+
+* `On Premise.` Set up a data flow when both Kibana and Elasticsearch are running on premise.
+* `On Premise Elastic Cloud.` Set up a data flow when Kibana is running on premise and Elasticsearch is running on Elastic Cloud.
+* `Elastic Cloud.` Set up a data flow when both Kibana and Elasticsearch are running on Elastic Cloud.
+
+[float]
+=== Creating a new tutorial
+1. Create a new directory in the link:https://github.com/elastic/kibana/tree/master/src/core_plugins/kibana/server/tutorials[tutorials directory].
+2. In the new directory, create a file called `index.js` that exports a function.
+The function must return a JavaScript object that conforms to the link:https://github.com/elastic/kibana/blob/master/src/core_plugins/kibana/common/tutorials/tutorial_schema.js[tutorial schema].
+3. Register the tutorial in link:https://github.com/elastic/kibana/blob/master/src/core_plugins/kibana/server/tutorials/register.js[register.js] by calling `server.registerTutorial(myFuncImportedFromIndexJs)`.
+4. Add image assets to the link:https://github.com/elastic/kibana/tree/master/src/core_plugins/kibana/public/home/tutorial_resources[tutorial_resources directory].
+5. Run Kibana locally to preview the tutorial.
+6. Create a PR and go through the review process to get the changes approved.
+
+[float]
+==== Variables
+String values can contain variables that are substituted when rendered. Variables are specified by `{}`.
+For example: `{config.docs.version}` is rendered as `6.2` when running the tutorial in Kibana 6.2.
+
+link:https://github.com/elastic/kibana/blob/master/src/core_plugins/kibana/public/home/components/tutorial/replace_template_strings.js#L23[Provided variables]
+
+[float]
+==== Markdown
+String values can contain limited Markdown syntax.
+
+link:https://github.com/elastic/kibana/blob/master/src/core_plugins/kibana/public/home/components/tutorial/content.js#L8[Enabled Markdown grammars]
+

docs/development/plugin-development.asciidoc

@@ -10,6 +10,7 @@ The Kibana plugin interfaces are in a state of constant development.  We cannot
 * <<development-uiexports>>
 * <<development-plugin-functional-tests>>
 * <<development-visualize-index>>
+* <<add-data-guide>>
 
 
 include::plugin/development-plugin-resources.asciidoc[]
@@ -18,4 +19,6 @@ include::plugin/development-uiexports.asciidoc[]
 
 include::plugin/development-plugin-functional-tests.asciidoc[]
 
-include::visualize/development-visualize-index.asciidoc[]
+include::visualize/development-visualize-index.asciidoc[]
+
+include::add-data-guide.asciidoc[]