Update organizations.md

Update to add JuliaHEP

community/organizations.md

@@ -109,6 +109,7 @@ The following is a non-comprehensive list of Julia GitHub organizations, grouped
 ### Physics/Quantum mechanics
 
 * [JuliaAtoms](https://github.com/JuliaAtoms) - Atomic physics in Julia
+* [JuliaHEP](https://github.com/JuliaHEP) - High-Energy Physics related projects.
 * [JuliaPhysics](https://github.com/JuliaPhysics) – Physics
 * [JuliaWaveScattering](https://github.com/JuliaWaveScattering) – Linear wave equations (acoustic, elastic, electromagnetic, quantum)
 * [JuliaQuantum](https://github.com/JuliaQuantum) – Quantum science and technology