Update README.md

README.md

 # Introduction
 
 
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 VecGeom is a geometry modeller library with hit-detection features as needed by particle detector simulation at the LHC and beyond.
 It was incubated by a Geant-R&D initiative and the motivation to combine the code of Geant4 and ROOT/TGeo into a single,
 better maintainable piece of software within the EU-AIDA program. As such it is close in scope to TGeo and Geant4 geometry modellers.