Ajout de l'héritage pour la classe Cell

source/Trek-12/Models/Cell.cs

@@ -1,8 +1,22 @@
 namespace Models;
 
-public class Cell
+public class Cell : Position
 {
-    private double x;
-    private double y;
-    private string back;
+    private int value;
+    public int Value
+    {
+        get => value;
+        set => value = value;
+    }
+
+    private string background;
+    public string Background
+    {
+        get => background;
+        set => background = value;
+    }
+    
+    public Cell(int x, int y) : base(x, y)
+    {
+    }
 }