Add documentation for Beatport plugin

docs/plugins/beatport.rst

@@ -0,0 +1,26 @@
+Beatport Plugin
+==============
+
+The ``beatport`` plugin adds support for querying the `Beatport`_ catalogue
+during the autotagging process. This can potentially be helpful for users
+whose collection includes a lot of diverse electronic music releases, for which
+both MusicBrainz and (to a lesser degree) Discogs show no matches.
+
+.. _Beatport: http://beatport.com
+
+Installation
+------------
+
+To see matches from the ``beatport`` plugin, you first have to enable it in
+your configuration (see :doc:`/plugins/index`). Then, install the `requests`_
+library (which we need for querying the Beatport API) by typing::
+
+    pip install requests
+
+And you're done. Matches from Beatport should now show up alongside matches
+from MusicBrainz and other sources.
+
+If you have a Beatport ID or a URL for a release or track you want to tag, you
+can just enter one of the two at the "enter Id" prompt in the importer.
+
+.. _requests: http://docs.python-requests.org/en/latest/