create base of player and square classe's

not-alone-server/src/main/java/fr/univnantes/alma/model/player/Creature.java

+package fr.univnantes.alma.model.player;
+
+/**
+ * Single Creature game player.
+ */
+public class Creature extends Player{
+}

not-alone-server/src/main/java/fr/univnantes/alma/model/player/Player.java

+package fr.univnantes.alma.model.player;
+
+/**
+ * Single game player.
+ */
+public abstract class Player {
+}

not-alone-server/src/main/java/fr/univnantes/alma/model/player/Tracked.java

+package fr.univnantes.alma.model.player;
+
+/**
+ * Single Tracked game player.
+ */
+public class Tracked extends Player{
+}

not-alone-server/src/main/java/fr/univnantes/alma/model/square/Square.java

+package fr.univnantes.alma.model.square;
+
+/***
+ * Game board square.
+ */
+public abstract class Square {
+
+    /**
+     * Square position.
+     */
+    private int position;
+
+    /**
+     * Create new instance of Square.
+     * @param position square position
+     */
+    public Square(int position) {
+        this.position = position;
+    }
+
+    /**
+     * Return the position of the square.
+     * @return position of the square
+     */
+    public int getPosition() {
+        return position;
+    }
+}

not-alone-server/src/main/java/fr/univnantes/alma/model/square/TrackedSquare.java

+package fr.univnantes.alma.model.square;
+
+public class TrackedSquare extends Square{
+
+    /**
+     * Create new instance of Square.
+     *
+     * @param position square position
+     */
+    public TrackedSquare(int position) {
+        super(position);
+    }
+}