Add Feature Planning section to README

Issue spring-projectsgh-69

Author: jgrandja

README.adoc

@@ -12,6 +12,11 @@ The ultimate goal of this project is to replace the Authorization Server support
 
 With the much needed help from our community, this project will grow in the same way that the original Spring Security OAuth project did.
 
+== Feature Planning
+This project uses https://www.zenhub.com/[ZenHub] to prioritize the feature roadmap and help organize the project plan.
+The project board can be accessed https://app.zenhub.com/workspaces/authorization-server-5e8f3182b5e8f5841bfc4902/board?repos=248032165[here].
+It is recommended to install the ZenHub https://www.zenhub.com/extension[browser extension] as it integrates natively within GitHub's user interface.
+
 == Code of Conduct
 This project adheres to the Contributor Covenant link:CODE_OF_CONDUCT.adoc[code of conduct].
 By participating, you are expected to uphold this code. Please report unacceptable behavior to [email protected].