Adding some teaching tips

_data/navigation.yml

@@ -4,5 +4,7 @@
   url: /curriculum/
 - title: Materials
   url: /materials/
+- title: Tips
+  url: /tips/
 - title: License
   url: /license/

tips.md

@@ -0,0 +1,15 @@
+---
+title: Tips for Instructors
+author: Greg Wilson
+layout: page
+permalink: /tips/
+---
+Keep the lesson script or instructor's notes on a separate screen, such as a tablet.
+This way learners aren't distracted by seeing the instructor's notes,
+and the instructor doesn't have to switch between screens to see what comes next.
+Some people like to use an iPad or tablet for this purpose,
+so that the projected screen that the learners can see only contains the live code or instructions for challenges.
+
+If there is the capability for two projected screens,
+use one for the live code
+and another that shows the example scripts (for reference) or instructions for challenges.