Add question to FAQ

 This is in response to a question we got in the issue tracker.

docs/faq.rst

@@ -1,7 +1,12 @@
 Frequently Asked Questions
 ==========================
 
+- How can I get all my tags?
 
-- How can I use this with factory_boy?
+ If you are using just an out-of-the-box setup, your tags are storred in the `Tag` model (found in `taggit.models`). If this is a custom model (for example you have your own models derived from `ItemBase`), then you'll need to query that one instead.
+
+ So if you are using the standard setup, ``Tag.objects.all()`` will give you the tags.
+
+ - How can I use this with factory_boy?
 
  Since these are all built off of many-to-many relationships, you can check out `factory_boy's documentation on this topic <https://factoryboy.readthedocs.io/en/stable/recipes.html#simple-many-to-many-relationship>`_ and get some ideas on how to deal with tags.