Added documentation for ProvidesFixtureInterface.

README.md

@@ -160,6 +160,37 @@ Provide an array of fixture class names:
         {}
     }
 
+or define alias names with ProvidesFixtureInterface:
+
+    namespace MyDataFixtures;
+
+    use Doctrine\Common\DataFixtures\AbstractFixture;
+    use Doctrine\Common\DataFixtures\DependentFixtureInterface;
+    use Doctrine\Common\DataFixtures\ProvidesFixtureInterface;
+    use Doctrine\Common\Persistence\ObjectManager;
+
+    class MyFixture extends AbstractFixture implements DependentFixtureInterface
+    {
+        public function load(ObjectManager $manager)
+        {}
+
+        public function getDepends()
+        {
+            return array('Other'); // fixture class(es) or provides string(s) fixture is dependent on
+        }
+    }
+
+    class MyOtherFixture extends AbstractFixture implements ProvidesFixtureInterface
+    {
+        public function load(ObjectManager $manager)
+        {}
+
+        public function getProvides()
+        {
+            return 'Other';
+        }
+    }
+
 **Notice** the ordering is relevant to Loader class.
 
 ## Running the tests: