update basti exercises

gt-workbench/exercise1/exercise.md

@@ -71,6 +71,8 @@ example(g, g.vertex_index);
 
 - Thomas ([repo](https://git.skewed.de/thomasrobiglio/exercises_retreat/-/tree/main/task1?ref_type=heads))
 
+- Basti ([repo](https://git.skewed.de/bastikusch1/workshop-exercises))
+
 # Task 2: Modify the code above to store for each vertex a vector with the 10 closest neighbors.
 
 Add your solution here as a link to a gitlab repository.