readme demo link added

Author: 04xRaynal

README.md

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 # A File Explorer created in Java Swing
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 ### It displays all the System files. Also lets you rename, delete and edit the files.
 
 #### JTree displays the System files in a tree format, JTable displays the list of files in the selected path.
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+Project Demo: [File Explorer](https://replit.com/@MajinVegetaSSJ2/File-Explorer?v=1)
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 Displaying System files