Update README.md

Author: NadiaMit

README.md

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 # Advent of Code 2021 in Java [![Java](https://skillicons.dev/icons?i=java)](https://skillicons.dev)
 
 This is my try on the Advent of code of 2021 challanges with Java!
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 I managed to complete 10 Days and got a total of 20 stars.
 
 ## Structure