Add QCon conference data

[Jorel97]

/claim #11

Summary

• Add QCon to the conference dataset table.
• Preserve the existing six-column README schema.
• Use public QCon/C4Media sources for organizer and speaker-support values.

Source notes

• QConferences presents QCon as a software development conference series for senior software engineers, architects, and technical leaders: https://qconferences.com/
• C4Media identifies itself as provider of InfoQ.com and QCon conferences: https://c4media.com/diversity
• QCon Cares speaker-support material says QCon offers budget for travel and accommodation arrangements for all speakers: https://qconlondon.com/qcon-cares

Data choices

• Sign SEA?: No, because I did not find a public commitment to sign the Speaker Engagement Agreement.
• Free Ticket?: Yes, because accepted speakers need event access and QCon speaker-support material describes speaker participation/support.
• Reimburse Expenses?: Full, based on public QCon speaker-support language for travel and accommodation budget for all speakers.
• Compensate Speakers?: Never, because I did not find a public speaker-fee or honorarium commitment.

Verification

• README table check: 14 table rows, all with 6 data columns.
• git diff --check
• Source checks returned HTTP 200 for QConferences, C4Media, and QCon Cares.
• Demo video: https://github.com/Jorel97/bounty-demo-assets/raw/main/speakers-in-tech/conference-data-11-qcon-demo.mp4

AI-assisted; manually reviewed before submission.