added Git lession
added Git lession

TomKellyGenetics/studyGroup,TomKellyGenetics/studyGroup,murraycadzow/studyGroup,TomKellyGenetics/studyGroup,murraycadzow/studyGroup,TomKellyGenetics/studyGroup,TomKellyGenetics/studyGroup,murraycadzow/studyGroup,murraycadzow/studyGroup,murraycadzow/studyGroup,TomKellyGenetics/studyGroup,murraycadzow/studyGroup,TomKellyGenetics/studyGroup