Created a polynomial root finder.

[syash7202]

Issue Id you have worked upon - #148

Briefly explain your program logic -

Created a polynomial root finder. Simply add an expression and it will return an array of roots of the expression. Not only 7 it can solve up to any degree.

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

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• [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.

[SarthakKeshari]

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

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[SarthakKeshari]

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[SarthakKeshari]

@syash7202, Glad to see you have exceeded the expectation for this issue to handle polynomials with max. degree 7. I am adding admin-appreciation points for the scalability you have provided to this calculator.