[DOCS]: Document which generated files are meant to be submitted

### Enhancement hasn't been filed before.

- [x] I have verified this enhancement I'm about to request hasn't been suggested before.

### Describe the enhancement you want to request

Hi,

I have searched online but could not find anything. Which files generated by drizzle are meant to be submitted to source control, and which ones are meant to be ignored?

If you could provide a sample `.gitignore` configuration, that would be cool.
Thanks!