[Feature] Adding Net Promoter Score (NPS) Calculator

[TBorundia]

Description

The Net Promoter Score (NPS) Calculator is a tool used to measure customer loyalty and satisfaction. The NPS is based on a single survey question: "How likely are you to recommend our company/product/service to a friend or colleague?" Respondents give a rating on a scale from 0 to 10, with 0 being "not at all likely" and 10 being "extremely likely."

NPS=%Promoters−%Detractors

Screenshots

Checklist

• I have checked the existing issues.
• I follow Contributing Guidelines of this project.
• I am a GSSOC'24 contributor.
• I am a IWOC'24 contributor.
• I am a JWOC'24 contributor.
• I am a SWOC'24 contributor.

Code of Conduct

• I agree to follow this project's "Code of Conduct".

[github-actions]

Hey @TBorundia, Welcome to the project CalcDiverse! 🎊
Thanks for opening an issue! 🙌 Please wait for the issue to be assigned. Happy Coding!! ✨

[TBorundia]

@Rakesh9100 @jessicachawla please assign this issue to me.
Thank You!

[jessicachawla]

@Rakesh9100 this issue can be assigned