created partial fraction calculator

[syash7202]

Issue Id you have worked upon - #338

Briefly explain your program logic -

Created a partial fraction calculator that takes a valid equation and returns a partial fraction of the equation.

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.

[syash7202]

@SarthakKeshari Kindly merge the PR, I have completed another task and have to create PR for the same.

[SarthakKeshari]

Congratulations 🎉 @syash7202 on your contribution. Thanks for adding value to this repository. 😊

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