introduced PostId and PostStatus and changed naming from Storage to Persistence

More/Repository/Persistence.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace DesignPatterns\More\Repository;
+
+interface Persistence
+{
+    public function generateId(): int;
+
+    public function persist(array $data);
+
+    public function retrieve(int $id): array;
+
+    public function delete(int $id);
+}