Update README.md

Author: alesanchezr

README.md

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 Complete selection of autograded CSS exercises, anyone interested in learning CSS!
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 ## One click installation:
 
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 Note: The exercises have automatic grading but its very rigid and strict, my recomendation is to ignore the tests and use them only as a recomendation or you can get frustrated.
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 ## How are the exercises organized?
 
 Each exercise is a small react application containing the following files: