Added Magic Number Calculator

[debangi29]

Fixes Issue🛠️

Closes #941

Description👨‍💻

Added The magic number calculator
The Magic Number Calculator allows users to check if a number is a magic number or to find all magic numbers within a given range. A magic number is a number that eventually becomes 1 when the sum of its digits is repeatedly calculated until a single digit is obtained.

Type of change📄

• New feature (non-breaking change which adds functionality)

How this has been tested✅

I have run it manually and checked for various values

Checklist✅

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added demonstration in the form of GIF/video file
• I am an Open Source Contributor

Screenshots/GIF📷

[github-actions]

Hey @debangi29, Welcome to the project CalcDiverse! 🎊
Thanks for your contribution! Your effort makes this project better. Keep it up! 🙌
Please wait for the PR to be reviewed. Happy Coding!! ✨

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[debangi29]

Please check for the PR once; and suggest changes if required @Rakesh9100
Thank Youu

[Rakesh9100]

Pls show the solution as well that how a number is Magic Number below the text 100 is a Magic Number! @debangi29

[debangi29]

I have done the required changes. Please check it @Rakesh9100

[debangi29]

Sir, please check and merge my PR...

[github-actions]

Congrats, Your pull request has been successfully merged 🥳🎉 Thank you for your contribution to my project 🚀 Keep Contributing!! ✨ @debangi29