databank verbinding in app.ts uitgezet, dummy json bodies toegevoegd in verschillende routes

backend/src/routes/group.ts

@@ -3,12 +3,22 @@ const router = express.Router();
 
 // information about a group (members, ... [TODO DOC])
 router.get('/:id', (req, res) => {
-    res.send('group');
+    res.json({
+        id: req.params.id,
+        assignment: '0',
+        students: [ '0' ],
+        submissions: [ '0' ],
+        // reference to other endpoint
+        // should be less hardcoded
+        questions: `/group/${req.params.id}/question`, 
+    });
 })
 
 // the list of questions a group has made
 router.get('/:id/question', (req, res) => {
-    res.send('questions');
+    res.json({
+        questions: [ '0' ],
+    });
 })
 
 export default router