Typing Speed Calculator

[Joiyad]

🛠️ Fixes Issue

Closes #488 ,

👨‍💻 Changes proposed

It is a totally new extension that lets users calculate their typing speed and accuracy. It will not affect other extensions. It will include files such as index.html, styles.css and scripts.js along with logo and manifest.json which together will act as an extension.

✔️ 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.

📄 Note to reviewers

📷 Screenshots

[narayan954]

Thanks for your contribution :)

__  Summary: :ok_hand: This code looks good