Roman Petrov - Added my Fellow Page for the IRIS-HEP Website (#2537)

* add photo

* Create pingmar.md

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Co-authored-by: Rob Tuck <robtuck@gmail.com>

Author: pingmar

_fellows/2025/pingmar.md

@@ -0,0 +1,29 @@
+---
+layout: fellow
+pagetype: fellow
+shortname: roman-petrov
+permalink: /fellows/roman-petrov.html
+fellow-name: Roman Petrov
+title: Roman Petrov - IRIS-HEP Fellow
+active: True
+dates:
+  start: 2025-06-23
+  end: 2025-09-15
+photo: /assets/images/team/fellows-2025/Roman-Petrov.jpg
+institution: Pryazovskyi State Technical University
+e-mail: petrov.romash@gmail.com
+focus-area: Analysis Systems (AS)
+challenge-area:
+project_title: Developing a Pythonic tool for smoothing histograms
+project_goal: >
+  Develop a user-friendly Python package that implements multiple histogram smoothing algorithms specifically designed for high-energy physics analyses, with integration into the Scikit-HEP ecosystem and comprehensive validation frameworks to help physicists reduce statistical noise in histograms while preserving underlying signal characteristics.
+mentors:
+- Mohamed Aly (Princeton University)
+- Alexander Held (University of Wisconsin–Madison)
+- Matthew Feickert (University of Wisconsin–Madison)
+proposal: /assets/pdf/fellows-2025/UKR004-proposal-Roman-Petrov.pdf
+presentations:
+current_status:
+github-username: pingmar
+linkedin-profile: https://www.linkedin.com/in/petrov-roman/
+---