$/**$

$*$ implements MathMatrix addition, $($this MathMatrix$)+$ rightHandSide.

$*$ pre: rightHandSide $!=$ null, rightHandSide.getNumRows$()=$ getNumRows$(),$

$*$ rightHandSide.getNumColumns$()=$ getNumColumns$()$

$*$ post: This method does not alter the calling object or rightHandSide

$*$ @param rightHandSide rightHandSide.getNumRows$()=$ getNumRows$(),$

$*$ rightHandSide.getNumColumns$()=$ getNumColumns$()$

$*$ @return a new MathMatrix that is the result of adding this Matrix to rightHandSide.

$*$ The number of rows in the returned Matrix is equal to the number of rows in this MathMatrix.

$*$ The number of columns in the returned Matrix is equal to the number of columns

$*$ in this MathMatrix.

$*/$

public MathMatrix add$($MathMatrix rightHandSide$)\{$

return null;

$\}$