Add Doctrine EntityManager configuration

[MAILPOET-2014]

lib/Doctrine/EntityManagerFactory.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace MailPoet\Doctrine;
+
+use MailPoetVendor\Doctrine\DBAL\Connection;
+use MailPoetVendor\Doctrine\ORM\Configuration;
+use MailPoetVendor\Doctrine\ORM\EntityManager;
+
+class EntityManagerFactory {
+
+  /** @var Connection */
+  private $connection;
+
+  /** @var Configuration */
+  private $configuration;
+
+  function __construct(Connection $connection, Configuration $configuration) {
+    $this->connection = $connection;
+    $this->configuration = $configuration;
+  }
+
+  function createEntityManager() {
+    return EntityManager::create($this->connection, $this->configuration);
+  }
+}