Changing the UI of Roots_Quadratic_Eqn

[newbie2508]

🛠️ Fixes Issue #492

👨‍💻 Changes proposed

I changed the UI of the Roots_Quadratic_Eqn chrome extension. I also added the formula for finding the roots of the equation

✔️ Check List (Check all the applicable boxes)

• [x] My code follows the code style of this project.
• [x] This PR does not contain plagiarized content.
• [x] The title of my pull request is a short description of the requested changes.

📷 Screenshots

[narayan954]

Thanks for your contribution :)