Update README.md

Author: bbrydsoe

README.md

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 This repository contains the material for the exercises for the participants of the course "Introduction to Git" as well as copies of the lectures. 
 
+**NOTE** Ignore the subdirectory **docs** for now, as well as the file **mkdocs.yml** - the course is in the process of being moved to GitHub pages instead of HackMD. 
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 ## Exercises
 
 The exercises are in the top-level file 'git_materials.zip'.