Add competition as instructor note

instructors/instructor-notes.md

@@ -2,4 +2,16 @@
 title: 'Instructor Notes'
 ---
 
-This is a placeholder file. Please add content here. 
+Optionally, to stimulate engagement, the workshop can be run as a competition, as follows:
+
+1. Instructors form groups of 4-6 participants. 
+2. Each group chooses a city name.
+3. Groups that solve a challenge or solve it first, receive a star. Stars are cumulated across lessons.
+4. At the end of the workshop, the team with most stars receives a prize.
+
+Notes:
+
+- The competition is not individual and the take-away is that everyone wins.
+- Awarding stars needs to be fair (i.e., with clear rules on how they are given) and balanced (i.e., when there's a tie, the instructor can choose to award the team with less stars).
+- It is important to form diverse groups with a good mix of experiences, backgrounds, gender.
+- Stars can be collected on a flipover in front of the room where everyone can see it.