jq cheat sheet

Create a new cheat sheet, for the `jq` command.

Besides the main purpose of the cheat sheet, coverage of the `jq` command,
it could be a test bed for such fearures:

* Big sectioned cheat sheet
* support for example output for commands.

The issue names no target file or test. Start by reviewing the repository's existing cheat sheets and the requested jq coverage, including sectioned content and example command output; done means a new jq cheat sheet is added with that coverage.

Written by the indexing model from the issue text.