Fill doctrine/orm bridge documentation (#141)

* Fill doctrine/orm bridge documentation

* Add see also links to doctrine/orm bridge documentation

* Add doctrine/orm documentation link

* Apply suggestions from code review

Co-authored-by: Maximilien Delangle <[email protected]>

---------

Co-authored-by: Maximilien Delangle <[email protected]>

Author: yann-eugone

docs/docs/bridges/doctrine-orm.rst

@@ -1,9 +1,16 @@
 Bridge with ``doctrine/orm``
 ============================================================
 
-todo
+Refer to the  `official documentation <https://www.doctrine-project.org/projects/orm.html>`__ on Doctrine's website.
+
 
 Read from entities in database
 ------------------------------------------------------------
 
-todo
+The reader will yield each entity of a specified class, one at a time.
+
+.. literalinclude:: doctrine-orm/entity-reader.php
+   :language: php
+
+.. seealso::
+   | :doc:`What is an item reader? </core-concepts/item-job/item-reader>`

docs/docs/bridges/doctrine-orm/entity-reader.php

@@ -0,0 +1,14 @@
+<?php
+
+declare(strict_types=1);
+
+use App\Entity\User;
+use Doctrine\Persistence\ManagerRegistry;
+use Yokai\Batch\Bridge\Doctrine\ORM\EntityReader;
+
+/** @var ManagerRegistry $managerRegistry */
+
+new EntityReader(
+    doctrine: $managerRegistry,
+    class: User::class,
+);