Add information about useful pytest's options in the README

[preetmishra]

There are a bunch of options that come with pytest. They can greatly help to boost up writing, debugging, sanity-checking and evaluating your tests. It would be helpful to update the README to include this in.

You may find it useful to explore $ pytest --help.

See also #518 (comment).

[preetmishra]

@zulipbot add "good first issue" "tests (pytest)"

[hedonhermdev]

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