There is a comprehensive Developer Manual for the Naked Objects Framework, available as a .docx:
For Release 7.1-beta: https://github.com/NakedObjectsGroup/NakedObjectsFramework/blob/master/Documentation/DeveloperManual.docx?raw=true
For Release 7.0 https://github.com/NakedObjectsGroup/NakedObjectsFramework/blob/7.0/Documentation/DeveloperManual.docx?raw=true
For Release 6: https://github.com/NakedObjectsGroup/NakedObjectsFramework/blob/6.0/Documentation/DeveloperManual.docx?raw=true
At the start of the manual, under 'Writing your first Naked Objects application' is a very simple worked example.
For help, and to view future development plans, please visit the Naked Objects Forum: http://nakedobjectsforum.azurewebsites.net/