ESO documentation

The current ESO documentation is rather sparse, it needs more examples, even our limited remote testing do more.

This can be addressed by someone new to the package, first approach is to copy the examples from the tests and write a few narrative sentences.

Start by locating the ESO documentation and the tests containing its existing examples. Use those examples as the basis for expanded documentation, adding a few narrative sentences that explain how to use them. Done means the ESO documentation contains more practical examples and explanatory context.

Written by the indexing model from the issue text.