Update README.md

Author: manuarora700

README.md

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 ⚡️ A code editor that compiles and runs your code on the web.
 
+<img src="https://github.com/manuarora700/react-code-editor/blob/main/demo.png" />
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 ## Features: 
 - Compile and execute code in 40+ programming languages.
 - Switch themes from a list of available themes.