Organize game files into their project directory and ensure proper build configuration

Moves all game source files and assets into the 'American-Identity-Project' directory and updates the manifest to point to the 'Display' class as the main entry point.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: f6819c21-e85d-45ac-acde-604db2cfa4fe
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: a9500e48-7f68-408f-a5c6-28df9f59fe00
Replit-Helium-Checkpoint-Created: true

American-Identity-Project/Sprite.java

@@ -0,0 +1,12 @@
+import java.awt.Image;
+import javax.swing.ImageIcon;
+
+public class Sprite {
+  ImageIcon icon;
+  Image sprite;
+
+  public Sprite(ImageIcon i) {
+    icon = i;
+    sprite = i.getImage();
+  }
+}