Create project_ATLAS.md

Author: maszyman

_gsocprojects/2025/project_ATLAS.md

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+---
+project: ATLAS
+layout: default
+logo: ATLAS-logo.png
+description: |
+  [ATLAS](http://atlas.cern) is one of the four major experiments at the [Large Hadron Collider](http://home.web.cern.ch/topics/large-hadron-collider) (LHC) at [CERN](http://home.cern/). It is a general-purpose particle physics experiment run by an international collaboration and is designed to exploit the full discovery potential and the huge range of physics opportunities that the LHC provides.
+---
+
+{% include gsoc_project.ext %}