Update setup.md

Author: qualiaMachine

learners/setup.md

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+This workshop provides a beginner-friendly overview of machine learning (ML) and common ML methods— including regression, classification, clustering, dimensionality reduction, ensemble methods, and a quick neural-network demo—using Python + scikit-learn. The broad coverage is designed to jump-start your ML journey and point you toward next learning steps.
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+### Prerequisites 
+A basic understanding of Python. You will need to know how to write a for loop, if statement, use functions, libraries and perform basic arithmetic. 
+Either of the Software Carpentry Python courses cover sufficient background.
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 ## Setup
 
 Please complete the setup at least a day in advance of the workshop. If you run into issues, contact the workshop organizers by email so you're ready to begin on time. The setup steps include: