Update README.md

added information about retrieving results from OSSC

README.md

@@ -17,6 +17,9 @@ The latest APK can always be downloaded from GitHub under Releases.
 ## Retrieving the weblog contents
 The weblog is in essence a Microsoft Sharepoint page and therefore accessible by the [Sharepoint URL protocol](https://docs.microsoft.com/en-us/previous-versions/office/developer/sharepoint-2010/ms478653(v=office.14)).
 
+## Retrieving exam results from OSSC
+Since HIS eG, the distributor of the QIS and LSF software, has not made an API public. The page must be programmatically crawled, and the HTML parsed in order to retrieve the exam result information. Unfortunately, this is inherently unstable and must be periodically updated as the OSSC platform is changed.
+
 ## External resources
 The fonts HSDSans-Regular and HSDSans-Elektro are used an included in this project.