add yaml file (#74)

Co-authored-by: Kaitlyn Johnson <kaitlyn.johnson@lshtm.ac.uk>

Author: kaitejohnson

_data/team/kaitlyn-johnson.yml

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+name: Kaitlyn Johnson
+github: kaitejohnson
+orcid: 0000-0001-8011-0012
+current-member: true
+bluesky: kaitejohnson9.bsky.social
+description: > 
+ Kaitlyn's work focuses on developing methods and tools for nowcasting, forecasting, and real-time analysis of infectious diseases using mathematical and statistical modeling. She previously developed methods for incorporating wastewater surveillance data into models to forecast COVID-19 hospital admissions at the U.S. CDC.