microsoft365: download office on macOS from AppStore

documentation/microsoft365.markdown

@@ -36,3 +36,12 @@ Setup
   * After submitting the request, wait for the confirmation mail.
 
 Please refer to the [pdf](https://unlimited.ethz.ch/download/attachments/29236528/CloudSubscription_en.pdf?version=1&modificationDate=1589870287809&api=v2) of Informatikdienste for detailed instructions and screenshots.
+
+
+### Install Office on macOS
+
+  * On macOS you can freely download all Microsoft Office programs directly from the App Store
+    - [Word](https://apps.apple.com/ch/app/microsoft-word/id462054704?l=en&mt=12)
+    - [Excel](https://apps.apple.com/ch/app/microsoft-excel/id462058435?l=en&mt=12)
+    - [PowerPoint](https://apps.apple.com/ch/app/microsoft-powerpoint/id462062816?l=en&mt=12)
+  * When opening Office for the first time, sign in with your `nethz-username@ethz.ch` and ETH password.