Create contrib folder with initial contents.

contrib/README.rst

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+Assorted contributions
+======================
+
+Various contributions which are not part of the official Python package but
+might be useful to other users nonetheless.

contrib/export_subscribers.sql

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+-- Export a list of currently active subscribers and subscription dates
+-- Tested to work with MySQL
+SELECT
+    IFNULL(newsletter_subscription.name, CONCAT_WS(' ', auth_user.first_name, auth_user.last_name)) AS name,
+    IFNULL(newsletter_subscription.email, auth_user.email) AS email,
+    subscribe_date
+FROM newsletter_subscription
+LEFT JOIN auth_user
+  ON newsletter_subscription.user_id = auth_user.id
+WHERE
+    subscribed = 1 AND
+    unsubscribed = 0
+