* Added OOP aproach to matrices
* created methods for minors, cofactors, and determinants and added corresponding doctests
* Added methods for adjugate, inverse, and identity (along with corresponding doctests) to matrix_class.py
A small bug persists that causes the doctest to fail.
After a couple Matrix objects are printed, the next one is printed in a different format.
* formatted matrix_class.py with python/black
* implemented negation and exponentiation as well as corresponding doctests in matrix_class.py. Also implemented eq and ne comparison operations
* changed __str__ method in matrix_class.py to align with numpy standard and fixed bug in cofactors method
* removed property decorators from several methods in matrix_class.py
