Merge pull request #2608 from matrix-org/rav/password_provider_doc

Start some documentation on password providers
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Password auth provider modules
==============================
Password auth providers offer a way for server administrators to integrate
their Synapse installation with an existing authentication system.
A password auth provider is a Python class which is dynamically loaded into
Synapse, and provides a number of methods by which it can integrate with the
authentication system.
This document serves as a reference for those looking to implement their own
password auth providers.
Required methods
----------------
Password auth provider classes must provide the following methods:
*class* ``SomeProvider.parse_config``\(*config*)
This method is passed the ``config`` object for this module from the
homeserver configuration file.
It should perform any appropriate sanity checks on the provided
configuration, and return an object which is then passed into ``__init__``.
*class* ``SomeProvider``\(*config*, *account_handler*)
The constructor is passed the config object returned by ``parse_config``,
and a ``synapse.handlers.auth._AccountHandler`` object which allows the
password provider to check if accounts exist and/or create new ones.
``someprovider.check_password``\(*user_id*, *password*)
This is the method that actually does the work. It is passed a qualified
``@localpart:domain`` user id, and the password provided by the user.
The method should return a Twisted ``Deferred`` object, which resolves to
``True`` if authentication is successful, and ``False`` if not.