More documentation work, changed addUsersToGroup back to taking a list of user IDs

Created new README, and finished `intro`

docs/todo.rst

@@ -1,19 +1,23 @@
 .. highlight:: python
+.. module:: fbchat
 .. _todo:
 
 Todo
 ====
 
+This page will be periodically updated to show missing features and documentation
 
-Functionality
--------------
 
-- Implement Client.changeThreadEmoji
-- Implement Client.changeNickname
+Missing Functionality
+---------------------
+
 - Implement Client.searchForThread
     - This will use the graphql request API
 - Implement Client.searchForMessage
     - This will use the graphql request API
+- Implement chatting with pages
+    - This might require a new :class:`models.ThreadType`, something like ``ThreadType.PAGE``
+- Rework `User`, `Thread` and `Message` models, and rework fething methods, to make the whole process more streamlined
 
 
 Documentation