CLASSROOMIO-T-4: Add deadline and show it was late or early

src/utils/functions/isSubmissionEarly.js

@@ -0,0 +1,5 @@
+export default (created_at, due_date) => {
+  return !!due_date
+    ? !!(new Date(created_at).getTime() <= new Date(due_date).getTime())
+    : true;
+};