Update README.md

Author: SumitKumargiri

README.md

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 ![image](https://github.com/SumitKumargiri/JavaScript-Tutorial/assets/96234273/b1d7c3bd-b523-4e61-858e-5f9218be095e)
 
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+JavaScript Documentation Link(MDN):- https://developer.mozilla.org/en-US/docs/Web/JavaScript
 
 This tutorial is made zero to Hero.
 JavaScript is a versatile and widely used programming language primarily known for its role in web development. Initially created to enhance the interactivity of web pages, JavaScript is now employed in various environments, including server-side development and mobile app development.