added docs for the persona plugin

docs/source/index.rst

@@ -61,6 +61,7 @@ Part 2: Core plugin documentation
    plugindocs/raven
    plugindocs/basic_auth
    plugindocs/openid
+   plugindocs/persona
 
 
 Part 3: Plugin Writer's Guide

docs/source/plugindocs/persona.rst

@@ -0,0 +1,2 @@
+.. include:: ../../../mediagoblin/plugins/persona/README.rst
+

mediagoblin/plugins/persona/README.rst

@@ -0,0 +1,41 @@
+.. _persona-chapter:
+
+================
+ persona plugin
+================
+
+The persona plugin allows users to login to you GNU MediaGoblin instance using
+`Mozilla's Persona`_.
+
+This plugin can be enabled alongside :ref:`openid-chapter` and
+:ref:`basic_auth-chapter`.
+
+.. note::
+    When :ref:`basic_auth-chapter` is enabled alongside this persona plugin, and
+    a user creates an account using their persona. If they would like to add a
+    password to their account, they can use the forgot password feature to do
+    so.
+
+.. _Mozilla's Persona: https://www.mozilla.org/en-US/persona/
+
+Set up the persona plugin
+=========================
+
+1. Install the ``requests`` package.
+
+2. Add the following to your MediaGoblin .ini file in the ``[plugins]`` section::
+
+    [[mediagoblin.plugins.persona]]
+
+3. Run::
+
+        gmg dbupdate
+
+   in order to create and apply migrations to any database tables that the
+   plugin requires.
+
+4. Run::
+
+        gmg assetlink
+
+   in order to persona's static assets.