add Doc

src/GomokuAI.java

@@ -2,10 +2,22 @@ import java.util.List;
 import java.util.Random;
 
 public class GomokuAI{
+    
+    /**
+    * This class is an extends of the class Player, this allows the GomokuAI to choose his move.
+    */
 
+    /** The random initialization */
     Random random = new Random();
+    /** The difficulty of the GomokuAI */
     int difficulty = 0;
 
+    //------------------Methods--------------------------
+    /**
+    * Return the coordinate of the move played by the Gomoku AI.
+    * @param Board The actual Gomoku board.
+    * @return The coordinate of the move played.
+    */
     public Coordinate chooseMove(GomokuBoard board){