DOCSP-42662: flystem gridfs adapter php (#988)

* DOCSP-42662: flystem gridfs adapter php

* MW suggestion

Author: rustagir

source/php-libraries.txt

@@ -90,6 +90,12 @@ Framework Integrations
   - `MongoDB Extension for Yii 2 <https://www.yiiframework.com/extension/yiisoft/yii2-mongodb>`__
     is a MongoDB integration for the Yii 2 framework.
 
+- Flysystem
+
+  - `MongoDB GridFS Adapter <https://flysystem.thephpleague.com/docs/adapter/gridfs/>`__
+    allows you to interact with MongoDB :manual:`GridFS </core/gridfs/>`
+    by using Flysystem.
+
 Tools and Projects
 ------------------