Clarify src folder required to get started

[paylett]

Explicitly stating to include the example src folder, or the test run step later does not work.

[ChampionAsh5357]

Explicitly stating to include the example src folder, or the test run step later does not work.

I mean...the example src folder doesn't need to be included. It could be any organizational structure for the src/<sourceSet>/java|resources folders. The text is not well worded, but the solution here would be to explain it better rather than say copy the example src folder, which I plan to do in #486 unless you want to take up the task of doing so for this page.

[ChampionAsh5357]

Superseded by #490