Added NPV Calculator [Issue No. #68]

[Manav173]

I have added the NPV calculator in the tools page as proposed, maintaining the style of the FinVeda website. Please review the changes.

Here is a photo for reference :-

Please check and merge the PR @ayush-that . I have also added the description of NPV Calculator as you mentioned in PR #168

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[Manav173]

Please check and merge the PR @ayush-that .