Add newtons square root method

[MrfksIv]

OTHERS
Added the Newton's method for square root estimation mentioned in #10 

Description of new feature, or changes

It implements the newton's recursive method for square root approximation. Test cases have also been added to check the implemented functionality. Docs have been modified to include the new function

Checklist

• [X] Your branch is up-to-date with the base branch
• [X] You've included at least one test if this is a new feature
• [X] All tests are passing

Related Issues and Discussions

Adds on the required features mentioned in #10 .

People to notify