struts2-archetype-plugin/src/main/resources/META-INF/archetype.xml

<?xml version="1.0" encoding="UTF-8"?>

<archetype>
  <id>struts2-archetype-plugin</id>
  <sources>
  	<source>src/main/java/MyResult.java</source>
  </sources>
  <resources>
  	<resource>src/main/resources/struts-plugin.xml</resource>
  	<resource>LICENSE.txt</resource>
  	<resource>NOTICE.txt</resource>
  	<resource>README.txt</resource>
  </resources>
</archetype>