Update README.md

Author: guiuba

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-![image](https://github.com/guiuba/CodeSignal-Challenges/assets/69851038/72207fa1-7398-4232-a227-85402cea77c7)
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 ## Hi everyone! Here I present my solutions to some CodeSignal exercises.
 
+![image](https://github.com/guiuba/CodeSignal-Challenges/assets/69851038/72207fa1-7398-4232-a227-85402cea77c7)
 
 CodeSignal is a technical assessment and interview platform operated by the American company BrainFights, Inc