Added badges of html, css, js

Author: RiyaGupta89

QUIZ WEB APP/README.md

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 This is a basic HTML, CSS, JAVASCRIPT quiz app where user can answer the questions that are being given in the quiz. And at the last your total score is displayed.
 
 ## 💻 Tech Stack
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+![HTML](https://img.shields.io/badge/html5%20-%23E34F26.svg?&style=for-the-badge&logo=html5&logoColor=white)
+![CSS](https://img.shields.io/badge/css3%20-%231572B6.svg?&style=for-the-badge&logo=css3&logoColor=white)
+![JS](https://img.shields.io/badge/javascript%20-%23323330.svg?&style=for-the-badge&logo=javascript&logoColor=%23F7DF1E)
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+<br>