Update first-lecture.md

first-lecture.md

@@ -25,4 +25,4 @@ To test the knowledge a quiz is available after each lecture.
 
 ## Material
 In order to particpate in this course and lecture, you will have to go through the diverse materials we have provide here in this project.
-All the material can be downloaded
+All the material can be found here: https://collaborating.tuhh.de/Early-Bird-Betreuende/learn2compost