add topic tags

[Beliavsky]

I suggest adding topic tags in the About section beyond the current quantiative-finance. Some possibilities are black-scholes, option-pricing but I'm sure there are many more.

[boring-cyborg]

Thanks for posting! It might take a while before we look at your issue, so don't worry if there seems to be no feedback. We'll get to it.

[github-actions]

This issue was automatically marked as stale because it has been open 60 days with no activity. Remove stale label or comment, or this will be closed in two weeks.

[github-actions]

This issue was automatically closed because it has been stalled for two weeks with no further activity.