created physics system and new Drawable interface

src/main/java/objects/world/Wall.java

@@ -1,14 +1,21 @@
 package objects.world;
 
 import core.Master;
+import core.math.Vector2D;
+import core.physics.Collidable;
+import core.physics.Hitbox;
+import core.physics.RectHitBox;
 import objects.GameObject;
 
 import java.awt.*;
 
-public class Wall extends GameObject {
+public class Wall extends GameObject implements Collidable {
+
+    private RectHitBox hitbox;
 
     public Wall(double x, double y, double xSize, double ySize) {
         super(x, y, xSize, ySize);
+        this.hitbox = new RectHitBox(new Vector2D(x, y), new Vector2D(xSize, ySize));
     }
 
     @Override
@@ -19,4 +26,24 @@ public class Wall extends GameObject {
     @Override
     public void update(Master master) {
     }
+
+    @Override
+    public boolean collidesWith(Collidable o) {
+        return this.hitbox.collidesWith(o.getHitbox());
+    }
+
+    @Override
+    public Hitbox getHitbox() {
+        return hitbox;
+    }
+
+    @Override
+    public Vector2D getCenterPos() {
+        return position;
+    }
+
+    @Override
+    public Vector2D getSize() {
+        return size;
+    }
 }