Add a page with features and screenshots

docs/features.rst

@@ -0,0 +1,25 @@
+Features and screenshots
+========================
+
+Admin interface screenshots
+---------------------------
+
+.. figure:: assets/screenshots/signin.png
+
+   Signing into the admin interface
+
+.. figure:: assets/screenshots/create.png
+
+   Creating a new user
+
+.. figure:: assets/screenshots/domains.png
+
+   Managing email domains
+
+.. figure:: assets/screenshots/status.png
+
+   Displaying service status
+
+.. figure:: assets/screenshots/token.png
+
+   Creating an authentication token