Update README

- Update URLs
- Add description
- Update copyright

README.rst

@@ -9,7 +9,9 @@ This is an application for use with the `AlekSIS`_ platform.
 Features
 --------
 
-The Mēnsa app provides functionality for board.
+The Mēnsa app provides an interface for uploading PDF menus attached by a calendar week in which this menu is valid.
+The app provides a public URL `current.pdf` which always returns the current menu PDF and adds an menu item linked to
+the same URL.
 
 Licence
 -------
@@ -17,7 +19,7 @@ Licence
 ::
 
   Copyright © 2019 Julian Leucker <leuckeju@katharineum.de>
-  Copyright © 2018, 2019 Jonathan Weth <wethjo@katharineum.de>
+  Copyright © 2018, 2019, 2020 Jonathan Weth <wethjo@katharineum.de>
 
   Licenced under the EUPL, version 1.2 or later
 
@@ -26,5 +28,5 @@ full licence text or on the `European Union Public Licence`_ website
 https://joinup.ec.europa.eu/collection/eupl/guidelines-users-and-developers
 (including all other official language versions).
 
-.. _AlekSIS: https://edugit.org/AlekSIS/AlekSIS
+.. _AlekSIS: https://edugit.org/AlekSIS/official/AlekSIS
 .. _European Union Public Licence: https://eupl.eu/