- get a copy of the folder (base -> 2014-paper)
 - show the files

 - run: git init
 - run: git status

 - run: git add paper.tex cvpr.sty
 - run: git status
 - run: git commit
 - run: git status
 - run: git add images/
 - run: git commit -m "......"

 - run: pdflatex paper.tex
 - run: git status
 - Q: what do we do with these? => ignore them, do not commit
 - edit: .gitignore
 -- add: !*.tex
 -- add: paper*
 -- add: *~
 - run: git status   # (en live pendant l'edit)
 - run: git add .gitignore
 - run: git commit -m "ignoring some generated files"
 
 - edit: the tex file, add: \includegraphics[width=5cm]{a_bird.png}
 - run: pdflatex paper.tex
 - run: acroread paper.pdf
 - run: git status
 - run: git diff
 - run: git commit    # rien a commiter
 - run: git add paper.tex
 - run: git commit -m "added image in paper"
 - run: git log