(DOCSP-32258): Add Atlas security features to Security page (#4722)

* Add Atlas security section

* copy review feedback

Author: davidhou17

source/security.txt

@@ -4,6 +4,12 @@
 Security
 ========
 
+.. contents:: On this page
+   :local:
+   :backlinks: none
+   :depth: 1
+   :class: singlecol
+  
 .. default-domain:: mongodb
 
 MongoDB provides various features, such as authentication, access
@@ -12,11 +18,13 @@ security features include:
 
 .. list-table::
    :header-rows: 1
-   :widths: 33 33 33
+   :widths: 20 20 20 20 20
 
    * - Authentication
      - Authorization
      - TLS/SSL
+     - Enterprise Only
+     - Encryption
 
    * - :doc:`/core/authentication`
 
@@ -36,16 +44,7 @@ security features include:
 
        :doc:`/tutorial/configure-ssl-clients`
 
-.. the blank column is required to keep everything lined up. 
-
-.. list-table::
-   :header-rows: 1
-   :widths: 50 50
-
-   * - Enterprise Only
-     - Encryption
-
-   * - :doc:`/core/kerberos`
+     - :doc:`/core/kerberos`
 
        :doc:`/core/security-ldap`
 
@@ -69,6 +68,51 @@ Security Checklist
 MongoDB also provides the :doc:`/administration/security-checklist` for
 a list of recommended actions to protect a MongoDB deployment.
 
+Secure Your {+atlas+} Deployments
+----------------------------------------
+
+{+atlas+}, the fully managed service for MongoDB deployments 
+in the cloud, comes preconfigured with secure default settings.
+Atlas also provides the following key security features:
+
+.. list-table::
+   :header-rows: 1
+   :widths: 30 70
+
+   * - Security Feature
+     - Description
+
+   * - Authentication and Authorization 
+     - In Atlas, you configure database users to access your
+       deployments. Atlas provides various ways to perform 
+       user authentication and authorization, 
+       including LDAP, OIDC, and X.509. To learn more, see 
+       :atlas:`Configure Authentication and Authorization
+       </security/config-db-auth/>`.
+  
+   * - Encryption
+     - By default, Atlas encrypts all data stored in your 
+       deployments and uses TLS/SSL to encrypt the connections to your 
+       databases. To add another layer of security, you can configure 
+       :atlas:`Encryption at Rest using Customer Key Management
+       </security-kms-encryption>`.
+
+   * - IP Access List
+     - Atlas allows connections only from addresses specified in 
+       the IP access list. To learn how to manage client connections
+       in Atlas, see :atlas:`Configure IP Access List Entries 
+       </security/ip-access-list/>`.
+   
+   * - Cloud Provider Support
+     - Atlas supports network peering connections and private endpoints
+       to secure your deployments hosted on AWS, Azure, and Google Cloud.
+       To learn more, see :atlas:`Set Up a Network Peering Connection 
+       </security-vpc-peering/>` and :atlas:`Configure Private Endpoints
+       </security-configure-private-endpoints/>`.
+
+For a full list of security features in Atlas, see 
+:atlas:`Security Features for Database Deployments </setup-cluster-security/>`.
+
 Report Suspected Security Bugs
 ------------------------------