feat: Add Columnar PHYSLITE Analysis Systems project (#2435)

* IRIS-HEP work related to supporting columnar anlaysis work in ATLAS using the
  Scikit-HEP and IRIS-HEP columnar analysis tools.

pages/projects/columnar-physlite.md

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+---
+permalink: /projects/columnar-physlite.html
+layout: project
+title: "Columnar PHYSLITE"
+shortname: columnar-physlite
+pagetype: project
+image: logos/Iris-hep-5-just-graphic.png
+blurb: Columnar data analysis workflows with ATLAS PHYSLITE
+maturity: Development
+maturity-note:
+github: https://github.com/CoffeaTeam/coffea/issues/1135
+start-date: 2023-11-01
+focus-area: as
+team:
+ - matthewfeickert
+ - alexander-held
+ - gordonwatts
+---
+
+ATLAS's PHYSLITE will be the common file format for ATLAS in Run 4 of the LHC [[ATLAS Software and Computing HL-LHC Roadmap](https://cds.cern.ch/record/2802918)].
+For it to be usable in the Analysis Systems ecosystem of columnar data analysis tools, it is necessary that the tools fully support i/o and analysis operations on PHYSLITE.
+This project will ensure that there is close coordination between the IRIS-HEP Analysis Systems team and ATLAS developers to validate that Analysis Systems workflows fully support PHYSLITE.
+
+### Presentations
+
+* Matthew Feickert, [Building a Columnar Analysis Demonstrator for ATLAS PHYSLITE Open Data using the Python Ecosystem](https://indico.cern.ch/event/1338689/contributions/6015915/), CHEP 2024, 2024-10-21