Update learn.json

Author: kiddopro

learn.json

@@ -6,6 +6,7 @@
     "preview": "https://github.com/4GeeksAcademy/react-tutorial-exercises/blob/master/preview.png?raw=true",
     "description": "Learn and practice React.js using hooks, interactive tutorial with dozens of react exercises, get instant feedback with automatic grading and watch video solutions afterwards.",
     "duration": 8,
+    "projectType": "tutorial",
     "difficulty": "easy",
     "videoSolutions": true,
     "bugsLink": "https://github.com/learnpack/learnpack/issues/new",