Maven recipe : Add maven-javadoc-plugin configuration

[yeikel]

 <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-javadoc-plugin</artifactId>
    <executions>
        <execution>
            <id>attach-javadocs</id>
            <goals>
                <goal>jar</goal>
            </goals>
        </execution>
    </executions>
</plugin>

[tkvangorder]

This is a good idea, I think we want to hold off adding this recipe until we have added plugin/plugin management to the semantic model, see #585

The reason for this is that in a multi-module maven project, we only want to add this plug-in to those maven projects that either have no parent or a parent that is external to the project.