Add online talk on cost-benefit calculation of testing

[salsolatragus]

Pull Request Template: Add a Conference or Workshop

Thank you for contributing! Most PRs are to add a new conference or workshop. The following are to help ensure you've added everything correctly:

Conference/Workshop Details

• [x] Name, Location, Date(s), Website URL and Status are required
• [ ] X / Twitter is Optional
• [x] Location should be City + Country or Online
• [x] Status can include information about registration, pricing, calls for proposals and can include links to all the above.

Checklist

• [x] I have added the conference/workshop to the correct YAML file (_data/current.yml or _data/past.yml)
• [x] The entry includes name, location, date(s), url and accurate status
• [x] The entry is in chronological order (soonest to furtherest away)
• [x] If there are any special characters in the name field (: or ; or '), the name must be in quotes (")
• [x] I have checked for duplicates to avoid listing the same event twice
• [x] Build runs successfully

Additional context

Add any other context or screenshots about the pull request here.