Add Hyounggyu Choi @BbolroC to the project's contributors / reviewers / maintainers list

[stevenhorsman]

Choi has been working at the primary maintainer of the s390x pipeline for the past 8 months on 'vanilla' kata-containers and recently on the CoCo CI pipeline as well.

• https://github.com/kata-containers/kata-containers/pulls?q=is%3Apr+author%3ABbolroC
• https://github.com/kata-containers/tests/pulls?q=is%3Apr+author%3ABbolroC

[stevenhorsman]

/cc @kata-containers/architecture-committee

[fidencio]

Huge +1 from me!

[bergwolf]

+1, welcome Choi!

[sameo]

+1 from me as well. Welcome Choi!

[fidencio]

I've added @BbolroC to the maintainers team! Welcome Choi!