feat(grid2d): add grid2d parent class

Author: jessicayung

algorithms/grid2d.py

@@ -0,0 +1,19 @@
+import numpy as np
+
+class Grid2D:
+
+    def __init__(self, grid_width, grid_height, visited=None):
+        self.grid_width = grid_width
+        self.grid_height = grid_height
+        if visited is None:
+            self.visited = np.zeros((grid_height, grid_width))
+        else:
+            self.visited = visited
+        self.steps_taken = np.zeros((grid_height, grid_width))
+
+    def neighbour(self, x, y):
+        neighbours = []
+        for dx in [-1,0,1]:
+            for dy in [-1,0,1]:
+                neighbours.append([x + dx, y + dy])
+        return neighbours