Add intro to second tutorial

Shati Patel · Shati Patel · commit 570e726ab574 · 2020-03-11T01:46:40.000Z
diff --git a/docs/language/learn-ql/beginner/catch-the-fire-starter.rst b/docs/language/learn-ql/beginner/catch-the-fire-starter.rst
@@ -1,6 +1,8 @@
 Catch the fire starter
 ======================
 
+You can use QL predicates and classes to solve your second mystery as a QL detective.
+
 Just as you've successfully found the thief and returned the golden crown to the castle, another terrible crime is committed. Early in the morning, a few people start a fire in a field in the north of the village and destroy all the crops!
 
 You now have the reputation of being an expert QL detective, so you are once again asked to find the culprits.
