Update README.md

Author: cprezzi

README.md

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 Installers for LaserWeb4
 
 Windows Users: Download exe from https://github.com/LaserWeb/LaserWeb4-Binaries/releases
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 Mac Users: Download dmg from https://github.com/LaserWeb/LaserWeb4-Binaries/releases
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 Linux Users: Download AppImage from https://github.com/LaserWeb/LaserWeb4-Binaries/releases
 
 # Documentation