Redirect gradle main class somewhere

[dbwiddis]

Is your feature request related to a problem?

#172 moved test code out of production, which is good.

It also removed the existing "main class" associated with gradle run

What solution would you like?

Point gradle run to a minimal extension for testing/debug use. We can create a new one that will execute Integration Tests.

What alternatives have you considered?

Point gradle run (back to) hello world. (Maybe a good temporary solution.)

Leaving test code in the production source tree (yuck, but maybe a single small independent runnable class that eventually disappears might be OK)

Having gradle run tell the user it doesn't do anything, and giving a menu of other options (like gradle helloWorld).

Do you have any additional context?

This is an easy fix but requires some discussion from contributors on where they want it to point!