[Feature] Add SIP Calculator

[AnandK-pm]

Description

Adding an SIP calculator for mutual funds.

• Users will be able to calculate their returns by giving several parameters as input , such as
  • SIP amount.
  • Monthly or quarterly option.
  • Expected % returns.
  • Total Duration (In years).

The formula used by the SIP calculator is:
FV = P × ({[1 + i]n – 1} / i) × (1 + i)

FV = Future value.
P = SIP amount.
i = Expected rate of return per frequency period.
n = Number of instalments.

Using this calculator, users will be able to strategize their personal mutual funds investements.

Screenshots

Proposed design /feature.

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

[AnandK-pm]

Closing this issue myself as it is already implemented.