add instructions for starting the game

Cynthia Rich · Cynthia Rich · commit b7e525825983 · 2017-07-08T10:56:42.000-04:00
diff --git a/README.md b/README.md
@@ -4,6 +4,8 @@ A project based learning activity for people who are getting started with Git an
 
 ### Instructions for playing the game
 
+1. Press the space bar to begin.
+
 You can play the game at: https://githubschool.github.io/github-games/
 
 >> _*SUPPORTED BROWSERS*: Chrome, Firefox, Safari, Opera and IE9+_
