New Aura and Cypher page

modules/ROOT/content-nav.adoc

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 ** xref:introduction/transactions.adoc[]
 ** xref:introduction/uniqueness.adoc[]
 ** xref:introduction/clause_composition.adoc[]
+** xref:introduction/aura.adoc[]
 
 * xref:syntax/index.adoc[]
 ** xref:syntax/values.adoc[]

modules/ROOT/pages/introduction/aura.adoc

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+= Aura and Cypher
+
+== Introduction
+
+Aura is Neo4j's fully managed cloud service. 
+It consists of AuraDB and AuraDS.
+AuraDB is a graph database service for developers building intelligent applications, and AuraDS is a Graph Data Science (GDS) service for data scientists building predictive models and analytics workflows. 
+
+AuraDB is available on the following tiers: 
+
+* AuraDB Free
+* AuraDB Pro
+* AuraDB Enterprise
+
+For more information, see link:{neo4j-docs-base-uri}/aura/auradb[Aura docs - Neo4j AuraDB overview].
+
+AuraDS is available on the following tiers: 
+
+* AuraDS Pro
+* AuraDS Enterprise
+
+For more information, see link:{neo4j-docs-base-uri}/aura/aurads[Aura docs - Neo4j AuraDS overview]
+
+== Using Cypher on Aura
+
+Most Cypher features are available on all tiers of Aura. 
+There are, however, some features which are not available to Aura instances.
+For example, it is not possible to create, alter, or drop databases using Aura, nor is it possible to alter or drop servers.
+
+There are also certain Cypher features which are only available on AuraDB Enterprise instances.
+These can be categorized as the role-based access-control features of Cypher. 
+For example, it is not possible to create, alter, or drop roles using AuraDB Free, AuraDB Pro, AuraDS Pro, or AuraDS Enterprise, but it is possible using AuraDB Enterprise. 
+
+The Cypher Manual uses two different labels to differentiate this distinction:
+
+[options="header,cols=""2a,2a"]
+|===
+| Label | Description
+| label:not-on-aura[] | Cypher feature not available on any tier of Aura.
+| label:aura-db-enterprise[] | Cypher feature only available on AuraDB Enterprise.
+|===
+
+////
+TODO: remove comment blocks once Aura Cheat Sheet has been published. 
+
+== Aura and the Cypher Cheat Sheet
+
+Each different tier of Aura has a customized version of the Cypher Cheat Sheet which only shows the features of Cypher available for the chosen tier. 
+
+The Aura Cheat Sheet can be accessed here: //Add url when available
+Note that the default tier is AuraDB Enterprise. 
+////