Bisection search algorithm

Given a number find its square-root, presice upto
N decimal places

Signed-off-by: Ajeet Jha <ajeetjha1@gmail.com>
Newton-Rapson approximation

Given a number, find its approximate root using
newton-rapson approximation.

Signed-off-by: Ajeet Jha <ajeetjha1@gmail.com>