add enterprise portal diagram

Author: paigecalvert

docs/vendor/enterprise-portal-about.mdx

@@ -13,6 +13,14 @@ The Enterprise Portal is a customizable, web-based portal that provides a centra
 
 Your customers can access the Enterprise Portal outside their application installation environment at a custom domain that you specify, making it easier for teams to manage instances and get support. 
 
+The following diagram shows how customers can use the Enterprise Portal to access release assets and installation instructions, as well as upload support bundles:
+
+![Customer uses install instructions in enterprise portal to install a release](/images/enterprise-portal-overview.png)
+
+[View a larger version of this image](/images/enterprise-portal-overview.png)
+
+As shown in the diagram above, your licensed customers can access the installation and update instructions for one or more application releases by logging in to the Enterprise Portal. The Enterprise Portal tracks the customer's installation attempts and progress, and shares those insights back to the Vendor Portal. After installing, customers can also upload support bundles in the Enterprise Portal. Support bundles uploaded to the Enterprise Portal are automatically made available to you in the Vendor Portal. 
+
 For information about using the Enterprise Portal, see [Access and Use the Enterprise Portal](enterprise-portal-use).
 
 The following shows an example of the Enterprise Portal dashboard: