Document logging

We should document the logging added in #450 - at the very least:

```
import logging
logging.basicConfig(level=logging.INFO)
```

but can also specifically set the logging level for the relevant sub-modules.

Start by reviewing issue #450 and searching the repository documentation for the logging setup added there. Document the basicConfig example and the option to set levels for relevant submodules; the work is done when users can find and follow those logging instructions.

Written by the indexing model from the issue text.