Add Mongolid library (#669)

* Add Mongolid library

This is based on mongodb/docs-ecosystem#463 with suggested changes applied.

* Revise Mongolid description

Author: jmikola

source/php-libraries.txt

@@ -39,6 +39,11 @@ Stand-alone Libraries
 - `MongoDB Transistor <https://github.com/bjori/mongo-php-transistor>`_:
   Lightweight ODM that utilizes the driver's Persistable interface.
 
+- `Mongolid <https://github.com/leroy-merlin-br/mongolid>`_: A fast ODM for PHP and
+  MongoDB, which implements both ActiveRecord and DataMapper design patterns and
+  supports embedded and referenced documents. An integration with
+  `Laravel <https://github.com/leroy-merlin-br/mongolid-laravel>`_ is also available.
+
 - `Yadm <https://github.com/makasim/yadm>`_ is a MongoDB ODM written for the
   **mongodb** extension. It is schema-less and supports fast object hydration
   and persistence, which makes it well-suited for modeling aggregation results.