Add Qanda

README.md

@@ -45,9 +45,12 @@ optimization methods for scientific simulation codes are explained.
 
 ### Questions
 
-For questions or remarks we have a slack channel where you can reach us:
+For questions or remarks, we have a slack channel where you can reach us:
 [Join PT1](https://join.slack.com/t/pt1hs21/shared_invite/zt-w3qcmy4j-Q~nPWsi3G6Hc_MQ_Udby8Q).
 
+**Experimental**: For questions specifically on the lecture slides, we are
+currently evaluating (https://qanda.link/)[Qanda]. Feel free to test it!
+
 ## Lecture slides, script, exercises and solutions
 
 Lecture slides, exercise sheets and solutions will be provided as part of this