update gitignore with default exercises dir created running it locally

bbelderbos · bbelderbos · commit 3ca384e104b1 · 2026-02-14T09:43:04.000+01:00
diff --git a/.gitignore b/.gitignore
@@ -23,3 +23,4 @@ target
 ### custom section ###
 
 notes/
+exercises
