steps: 

feature.xml 

  pick one of the main plugins in that feature and list as "plugin=xxxx" attribute of feature element. 

feature.properties

  change provider name to be "Eclipse Web Tools Platform"

in plugin (that you choose above): 

  add/copy  following files

    about.ini
    about.properties
    WTP_icon_x32_v2.png (or icons/WTP_icon_x32_v2.png). 

  edit: 

    about.ini: 
    
       make sure the 'featureImage' is correct for where you put the icon file

    about.properties: 
    
        The first line, at least, needs to be changed to match your feature name. 
        And add/edit any other information you think important. 

    build.properties: 

        make sure the icon file and about.* files are included

    plugin.properties: 

        change provider name to be "Eclipse Web Tools Platform"
        change the plugin name to be the same as the feature name (or, at least something meaningful in that context, 
        (see bug 277594 if interested in the odd design, or bug?)