Added a FAQ to doc and Document the fact that we dont support motor

docs/faq.rst

@@ -0,0 +1,13 @@
+==========================
+Frequently Asked Questions
+==========================
+
+Does MongoEngine support asynchronous drivers (Motor, TxMongo)?
+---------------------------------------------------------------
+
+No, MongoEngine is exclusively based on PyMongo and isn't designed to support other driver.
+If this is a requirement for your project, check the alternative:  `uMongo`_ and `MotorEngine`_.
+
+.. _uMongo: https://umongo.readthedocs.io/
+.. _MotorEngine: https://motorengine.readthedocs.io/
+

docs/index.rst

@@ -23,6 +23,9 @@ MongoDB. To install it, simply run
 :doc:`upgrade`
   How to upgrade MongoEngine.
 
+:doc:`faq`
+  Frequently Asked Questions
+
 :doc:`django`
   Using MongoEngine and Django
 
@@ -73,6 +76,7 @@ formats for offline reading.
     apireference
     changelog
     upgrade
+    faq
     django
 
 Indices and tables