Variance-Standard Deviation Converter Added

[VincentPaulV]

Issue Id you have worked upon -

I have worked on Issue No. #446 (Variance-Standard Deviation calculator)

Briefly explain your program logic -

It basically boils down to

1. Taking user input
2. Finding square root (for Standard Deviation) or square (for variance) of the input
3. Displat=y result

Screenshots(Attach 2 screenshots of your own input and output) -

By raising this PR I affirm that -

• [x] My code follows the guidelines of this project.
  

• [x] I have performed a self-review of my own code.
  

• [x] I have commented my code.
  

• [x] My code gives the correct output.
  

• [x] I affirm that I strictly follow contributing guidelines and code of conduct.

[VincentPaulV]

Hey there @SarthakKeshari, Here is the PR for the Variance-Standard Deviation calculator.

Thanks!!

[SarthakKeshari]

Congratulations 🎉 @VincentPaulV on your contribution. Thanks for adding value to this repository. 😊

Let's celebrate this fest 😃 by providing more developers 👨‍💻👩‍💻 an opportunity to contribute. Help us make this repository reach far and more by sharing this to your friends and colleagues.

Your efforts can make difference.

[SarthakKeshari]

Hey 👋, may you also encourage us by clicking the star icon on the repository main page. ⭐