Add trademark to readme

README.rst

@@ -4,7 +4,7 @@ AlekSIS (School Information System) — App Matrix (Integration with Matrix/
 AlekSIS
 -------
 
-This is an application for use with the `AlekSIS`_ platform.
+This is an application for use with the `AlekSIS®`_ platform.
 
 Features
 --------
@@ -25,5 +25,5 @@ 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/AlekSIS
 .. _European Union Public Licence: https://eupl.eu/