docs: add bcfre as a contributor for code

[allcontributors]

Adds @bcfre as a contributor for code.

This was requested by rayrayraykk in this comment

[cla-assistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}