Update README.md

README.md

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 # Description
 This project contains the following elements:
 - the detailed results obtained on each instance for each experiment (file Additional_results.pdf)
-- the code used to run the experiments, and instructions on how execute it (archive source_code.zip)
+- the source code used to run the experiments, with instructions for its execution (archive source_code.zip)
 - the best pareto fronts obtained considering all our experiments (archive bestFronts.zip)