Merge pull request #5 from amyschoen/books

Updating description in README.md

Author: githubteacher

README.md

@@ -1,6 +1,6 @@
 # Your GitHub Learning Lab Repository for Introducing GitHub
 
-Welcome to **your** repository for your GitHub Learning Lab course. This repository will be used during the different activities that I will be guiding you through.
+Welcome to **your** repository for your GitHub Learning Lab course. This repository will be used during the different activities that I will be guiding you through. See a word you don't understand? We've included an emoji 📖 next to some key terms. Click on it to see its definition.
 
 Oh! I haven't introduced myself...