Update learn.json

Author: kiddopro

learn.json

@@ -6,6 +6,7 @@
     "description": "Learn and master functional programing by doing auto-graded interactive exercises.",
     "duration": 10,
     "difficulty": "easy",
+    "projectType": "tutorial",
     "videoSolutions": true,
     "bugsLink": "https://github.com/learnpack/learnpack/issues/new",
     "graded": true,