Add material and solution for week 9

week9/material/.DS_Store

week9/material/decision_tree/decision_tree.py

week9/material/decision_tree/dt_node.py

week9/material/decision_tree/guess_who.csv

week9/material/decision_tree/guess_who_samples.py

week9/material/guess_who.csv

week9/material/reinforcement_learning/agent_programs.py

...material/reinforcement_learning/reinforcement_learning.py

week9/material/reinforcement_learning/tictactoe_app.py

...rial/reinforcement_learning/tictactoe_game_environment.py

week9/solution/.DS_Store

week9/solution/decision_tree/decision_tree.py

week9/solution/decision_tree/dt_node.py

week9/solution/decision_tree/guess_who.csv

week9/solution/decision_tree/guess_who_samples.py

week9/solution/reinforcement_learning/agent_programs.py

...solution/reinforcement_learning/reinforcement_learning.py

week9/solution/reinforcement_learning/tictactoe_app.py

...tion/reinforcement_learning/tictactoe_game_environment.py

week9/solution/reinforcement_learning/vfunction.json