add @martinezc1's talk

Author: maelle

content/events/2026-07-06-useR-2026.md

@@ -37,4 +37,6 @@ July 06-09, 2026 [useR! 2026](https://user2026.r-project.org) will take place in
 
 * Katrina Brock (reviewer of distionary) will present [Travel Paths: Bridging the usability gap in open source animal movement algorithms ](https://events.digital-research.academy/event/109/contributions/462/) on Jul 9, 2026, 10:30 AM.
 
+*  Christian Martinez (nycOpenData maintainer) will present [Teaching Reproducibility by Design: An End-to-End R Workflow Using Quarto, Open Data, and Package Development](https://events.digital-research.academy/event/109/contributions/385/) on Jul 9, 2026, 11:30 AM.
+
 rOpenSci community manager Yanina Bellini Saibene has served on the conference [program committee](https://user2026.r-project.org/about/organizers.html).