[Feature] EPF calculator

[DyuthiVivek]

Hi @ighoshsubho

We can add a calculator to compute the accumulated amount in EPF fund at retirement.

I am a GSSoC '23 contributor, please assign this issue to me.

[github-actions]

👋 @DyuthiVivek

Thank you for raising an issue. We will investigate into the matter and get back to you as soon as possible.

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[github-actions]

Hello @DyuthiVivek, thank you for raising an issue. 🙌 I have assigned the issue to you. You can now start working on it. If you encounter any problems, please feel free to connect with us. 👍