create freight order entity and use case for creating

src/FreightOrder/FreightOrder.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace FreightQuote\FreightOrder;
+
+class FreightOrder
+{
+    public function getId()
+    {
+    }
+}

src/FreightOrder/UseCases/CreateFreightOrder.php

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+<?php
+
+namespace FreightQuote\FreightOrder\UseCases;
+
+use FreightQuote\FreightOrder\FreightOrder;
+
+class CreateFreightOrder
+{
+    public function execute(): ?FreightOrder
+    {
+        return new FreightOrder();
+    }
+}

src/FreightOrder/UseCases/CreateFreightOrderRequestDTO.php

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+<?php
+
+namespace FreightQuote\FreightOrder\UseCases;
+
+class CreateFreightOrderRequestDTO
+{
+}