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The scenario of a minus task is a file named scenario.yaml, located at the toplevel of the task directory.
The syntax of the file is YAML, a popular file format. The full YAML specification is quite large but only a small subset of YAML is needed for scenario files, and this subset is very intuitive, and easily understandable just by looking at a scenario.yaml example.
Please bear in mind that YAML is indentation sensitive, just like python. YAML will follow whatever indentation system the scenario file uses, provided that it is consistent within the file. Note that in particular you should not mix spaces and tabs (beware, some text editors do that silently and need to be properly configured to avoid that). The suggested best practice is to use two spaces for indentation.