Added Internal Angles of Polygon!

[VincentPaulV]

Issue Id you have worked upon -

Internal Angles of a Polygon #607

Briefly explain your program logic -

1. Take input
2. Multiply 180(input-2)
3. Return ans

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's the PR for the #607 issue. Thanks!!

[Vedansh-Keshari]

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

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