Adding the Node2D class

Node 2D class with ability to add and remove sprites from it’s list.
Adding the Heuristic interface

Heuristic interface will be a functional basic algorithm for path
finding using the most basic features only.
Adding the Manhattan Heuristic

The Manhattan heuristic is a slightly more advanced pathfinding
algorithm. Capable of 4 direction movement only.
Adding the Map2D class

This will be the global class for mapping.
Updating the Readme with a list of goal features

Features are obviously not yet implemented.