Add CoDaS-HEP 2026 event details (#2892)

Added details for the CoDaS-HEP 2026 event including name, dates, location, and description.

Author: rct225

_data/events/20260713-CoDaS-HEP.yml

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+name: CoDaS-HEP 2026 - Computational and Data Science Training for High Energy Physics
+startdate: 2026-07-13
+enddate: 2026-07-17
+location: Princeton University
+meetingurl: http://codas-hep.org
+image:
+description: |
+The CoDaS-HEP school aims to provide a broad introduction to these critical skills as well as an overview of applications High Energy Physics. Specific topics to be covered at the school include:
+  - Parallel Programming
+  - Data Science Tools and Techniques
+  - Machine Learning - Technology and Methods
+  - Practical skills: performance evaluation, collaborative use of git/github
+  - The program includes both lectures and practical hands-on exercises.
+
+labels:
+  - training