(DOCSP-15342) Feature matrix (#13)

* (DOCSP-15342) Feature matrix

Author: zach-carr

source/includes/feature-matrix.rst

@@ -0,0 +1,82 @@
+.. list-table::
+   :widths: 60 30 30
+   :header-rows: 1
+
+   * - Feature
+     - Commercial |service|
+     - |servicegov-short|
+
+   * - Free/ shared tier clusters
+     - :icon-fa5:`check`
+     -
+
+   * - ``M10`` clusters
+     - :icon-fa5:`check`
+     -
+
+   * - AWS GovCloud regions
+     -
+     - :icon-fa5:`check`
+
+   * - Cross-region clusters
+     - :icon-fa5:`check`
+     - :icon-fa5:`check` [#cross-region]_
+
+   * - Private Link for GovCloud
+     - 
+     - :icon-fa5:`check`
+
+   * - VPC Peering for GovCloud
+     -
+     - :icon-fa5:`check`
+
+   * - ``SCRAM-SHA1`` database authentication
+     - :icon-fa5:`check`
+     -
+
+   * - ``SCRAM-SHA256`` database authentication
+     - :icon-fa5:`check`
+     - :icon-fa5:`check`
+
+   * - AWS IAM database authentication
+     - :icon-fa5:`check`
+     - :icon-fa5:`check`
+
+   * - AWS IAM (GovCloud) database authentication
+     -
+     - :icon-fa5:`check`
+
+   * - Backup for FedRAMP Moderate regions
+     - :icon-fa5:`check` [#fr-moderate-backup]_
+     - :icon-fa5:`check` [#fr-moderate-backup]_
+
+   * - Backups for |aws-fr-high| regions
+     -
+     - :icon-fa5:`check` [#govcloud-backup]_
+
+   * - |service| Search
+     - :icon-fa5:`check`
+     - :icon-fa5:`check`
+
+   * - |service| Online Archives
+     - :icon-fa5:`check`
+     - 
+
+   * - |service| Data Lake
+     - :icon-fa5:`check`
+     -   
+
+.. [#cross-region]
+   
+   You cannot deploy clusters across government 
+   and commercial regions in the same project.
+
+.. [#fr-moderate-backup]
+
+   |servicegov-short| backups for |aws-fr-moderate| deployments are 
+   stored in |aws-fr-moderate| regions.
+
+.. [#govcloud-backup]
+
+   |servicegov-short| backups for |aws-fr-high| deployments are stored 
+   in |aws-fr-high| regions.

source/introduction/supported-features.txt

@@ -12,6 +12,8 @@ Supported Features
    :depth: 1
    :class: singlecol
 
-|servicegov| supports the following subset of |service| features:
+|servicegov| supports a subset of |service| features and some unique 
+features. The following table compares |service| features to those in 
+|servicegov|:
 
-- :ref:`<atlas-search>`
+.. include:: /includes/feature-matrix.rst