Added calculator extension | New added extension

[anurag8546]

🛠️ Fixes Issue

👨‍💻 Changes proposed

🔧 Check List (Check the type of issue it fixes)

• [ ] Bug Fix
• [x] New Extension
• [ ] Enhancement
• [ ] Documentation

✔️ 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.

[anurag8546]

@whiteHatpro added : )