made the board for 4 connect

ConnectFour/src/Executor.java

@@ -0,0 +1,21 @@
+import javax.swing.*;
+
+public class Executor extends JFrame {
+
+    public Executor(){
+        initUI();
+    }
+
+    private void initUI(){
+        Board board = new Board();
+        add(board);
+        pack();
+        setDefaultCloseOperation(EXIT_ON_CLOSE);
+        setLocationRelativeTo(null);
+    }
+
+    public static void main(String[] args) {
+        Executor executor = new Executor();
+        executor.setVisible(true);
+    }
+}