MAGETWO-91200: Update documentation for PageBuilder EAP

- update README to include links to doc topics and feedback issues

Author: James Calcaben

README.md

@@ -21,6 +21,30 @@ We offer two methods for installing PageBuilder:
 [Composer package]: app/code/Magento/PageBuilder/docs/install.md#composer-installation
 [GitHub repository]: app/code/Magento/PageBuilder/docs/install.md#github-installation
 
+## Developer documentation
+
+This project repository contains PageBuilder developer documentation on the following topics:
+
+1. [Architecture overview]
+1. [BlueFoot to PageBuilder data migration]
+1. [Third-party content type migration]
+1. [Iconography]
+1. [Module integration]
+1. [Additional data configuration]
+1. [Content type configuration]
+1. [How to add a new content type]
+1. [Events]
+
+[Architecture overview]: app/code/Magento/PageBuilder/docs/architecture-overview.md
+[BlueFoot to PageBuilder data migration]: app/code/Magento/PageBuilder/docs/bluefoot-data-migration.md
+[Third-party content type migration]: app/code/Magento/PageBuilder/docs/new-content-type-example.md
+[Iconography]: app/code/Magento/PageBuilder/docs/iconography.md
+[Module integration]: app/code/Magento/PageBuilder/docs/module-integration.md
+[Additional data configuration]: app/code/Magento/PageBuilder/docs/custom-configuration.md
+[Content type configuration]: app/code/Magento/PageBuilder/docs/content-type-configuration.md
+[How to add a new content type]: app/code/Magento/PageBuilder/docs/how-to-add-new-content-type.md
+[Events]: app/code/Magento/PageBuilder/docs/events.md
+
 ## Contribute to PageBuilder
 
 We appreciate any and all contributions to PageBuilder. 
@@ -46,8 +70,8 @@ To help you prepare for these changes, we are publishing a [roadmap] of features
 We want to hear what you think of PageBuilder!
 We are particularly interested on your thoughts on the following:
 
-* How would you customize PageBuilder and what do you need to accomplish this task?
-* What web content API do you use or would like to see in PageBuilder?
+* [How would you customize PageBuilder and what do you need to accomplish this task?](magento/magento2-page-builder#57)
+* [What web content API do you use or would like to see in PageBuilder?](magento/magento2-page-builder#58)
 
 To participate in technical discussions and ask questions, join us in [Slack].