fix: classes renaming to correspond to UML diagram

Behavioral/State/ContextOrder.php

@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DesignPatterns\Behavioral\State;
+
+class ContextOrder
+{
+    private StateOrder $state;
+
+    public static function create(): ContextOrder
+    {
+        $order = new self();
+        $order->state = new CreateOrder();
+
+        return $order;
+    }
+
+    public function setState(StateOrder $state)
+    {
+        $this->state = $state;
+    }
+
+    public function proceedToNext()
+    {
+        $this->state->proceedToNext($this);
+    }
+
+    public function toString()
+    {
+        return $this->state->toString();
+    }
+}