Add functionality to display a chess board and pieces

Adds new Java files for Chess game logic, piece representation, and display initialization, along with imports for GUI and event handling.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: f6819c21-e85d-45ac-acde-604db2cfa4fe
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: b3669ecc-6df5-4941-bb0c-6a0ed9bbd81e
Replit-Helium-Checkpoint-Created: true

Chess/Piece.java

@@ -0,0 +1,18 @@
+import java.awt.*;
+import java.util.*;
+
+public class Piece{
+    ArrayList<Integer> legalMoves;
+    int x,y;
+    Image sprite;
+    
+    public Piece(int x, int y, Image sprite){
+        this.x = x;
+        this.y = y;
+        this.sprite = sprite;
+    }
+    
+    public void draw(Graphics g){
+        g.drawImage(sprite,x * 40,y * 40,null);
+    }
+}