Add QCon conference data

[Souvikdeb2612]

Summary

• Add QCon to the conference dataset with C4Media as organizer.
• Use conservative SEA/payment values where I did not find public commitments.

Source notes

• C4Media identifies itself as the provider of InfoQ and QCon conferences: https://c4media.com/diversity
• QCon states it budgets for speaker travel and accommodation arrangements: https://qconsf.com/qcon-cares
• QCon speaker information states the conference fee is covered for speakers: https://qconnewyork.com/ny2012/qcon-nyc-2012/speakerinformation/index.html

Verification

• git diff --check

/claim #11