haha uh oh. This might be a bit more of a complicated question for me to answer. To start out on the emulator, all you should do is, rename the
js file as "whatever-assistant.
js" and throw it into the app/assistants folder of your application (in this case HelloWorld).
Open up the sources.json folder in the root folder of your application and include it in the list. You will see the formatting, just follow that but add your file name in it as well.
Package and Install. See what it does!
*edit*
This will include your
js file into the app itself, but I'm not sure how you would call up this virtual keyboard and/or use it. You'll have to figure out the integration process yourself. Or maybe ask someone who actually knows what they're talking about. haha. Sorry!