Update README.md

Signed-off-by: Fabiana 🚀  Campanari <113218619+FabianaCampanari@users.noreply.github.com>

Author: FabianaCampanari

README.md

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 ## Extras Excercise:
 
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 ### 1. [Develop a Mathematical Model – Linear Programming (LP)]():
 
 📘 Problem Statement in English
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 Mathematically model the Linear Programming (LP) problem.
 
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 ### [Modeling step-by-step]():
 
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