feat: implement the Co-interior Pairs calculator #609

[hubsMIT1]

Issue Id you have worked upon -

609

Briefly explain your program logic -

• Added Co-Interior Angle calculation based on the sum of 180 degrees.
• The calculateCoInteriorAngle function takes one angle and computes the other.
• It uses parseFloat and sets the result to two decimal places with toFixed(2).

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

Attach here

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.

[SarthakKeshari]

@hubsMIT1, Kindly take a pull, and add your changes in the file that I have created, since merge conflicts are occurring.