Update README.md

Author: Ruben2163

README.md

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 A Python-based Linux terminal simulation that allows users to execute basic file system commands within a virtual environment. Includes support for file management, directory navigation, and command aliases.
 
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-![Demo](READMEIMGS/demo.png)
+![Demo](READMEIMGS/demo.jpg)
 ## **Features**
 - **File System Management**:
   - Create folders and files (`mkdir`, `touch`).