Added documentation about the feature

Doc update

README.md

@@ -186,14 +186,34 @@ To paginate [DoctrineORM](http://www.doctrine-project.org/projects/orm) query ob
 ```php
 <?php
 
-use Pagerfanta\Adapter\DoctrineORMAdapter;
+use  Pagerfanta\Adapter\DoctrineORMAdapter;
 
 $queryBuilder = $entityManager->createQueryBuilder()
     ->select('u')
     ->from('Model\Article', 'u');
 $adapter = new DoctrineORMAdapter($queryBuilder);
 ```
 
+### DoctrineORMNativeQueryAdapter
+
+To paginate [Doctrine native queries](http://doctrine-orm.readthedocs.org/en/latest/reference/native-sql.html) objects.
+
+```php
+<?php
+
+use Pagerfanta\Adapter\DoctrineORMNativeQueryAdapter;
+use Doctrine\ORM\Query\ResultSetMappingBuilder;
+
+$query = 'SELECT * FROM article';
+
+$rsm = new ResultSetMappingBuilder($entityManager);
+$rsm->addRootEntityFromClassMetadata('Pagerfanta\Tests\Adapter\DoctrineORM\User', 'u');
+
+$adapter = new DoctrineORMNativeQueryAdapter($nq);
+```
+
+> The adapter accept 2 callable that should modify a given (as parameter) native query to respectively: make a count query / make a slice query
+
 ### DoctrineODMMongoDBAdapter
 
 To paginate [DoctrineODMMongoDB](http://www.doctrine-project.org/docs/mongodb_odm/1.0/en/) query builders.

src/Pagerfanta/Adapter/DoctrineORMNativeQueryAdapter.php

@@ -38,6 +38,7 @@ class DoctrineORMNativeQueryAdapter implements AdapterInterface
     /**
      * @param NativeQuery  $query                     A DBAL query builder.
      * @param callable     $countQueryBuilderModifier A callable to modify the query to count.
+     * @param callable     $sliceQueryBuilderModifier A callable to modify the query to slice it (the default should do the job most part of the time).
      * @throws InvalidArgumentException
      */
     public function __construct(NativeQuery $query, $countQueryBuilderModifier = null, $sliceQueryBuilderModifier = null)