Create A* search algorithm and added to search algorithms.

Heuristics file with maze heuristics.

Moved puzzle goal to the top

Created test case for mazes

refactored

Queens problem, solved. Does not look pretty. Successor, is allowed and is goal completed. Breadth first function still not touched

breadth first algorithm untouched. Sudoku Successors and allowed moves completed. Tested with solution testing.py. Sudoku is_goal also completed

first commit breadth first search, algorithm done. Is_goal and Successors is jst skeleton code