added includemod example for javascript

[alwinmark]

accordingly to "http://vertx.io/mods_manual.html#including-the-resources-of-modules"

• open a PR to fit and link this example at https://github.com/vert-x/vert-x.github.io/blob/master/mods_manual.html#L310 (corresponding issue: Modulenames does not fit schema in include module ressource example vert-x.github.io#13)

[alwinmark]

Once you have signed the Eclipse CLA, make a note on the github issue that you have signed the CLA, and then you can submit a pull request via github. ✅