Add french book "TikZ pour l'impatient", G. Tisseau
Add french book "Asymptote. Démarrage rapide", Grospellier
Fix markdown
Add french book "Un manuel de Metapost", J. Hobby
Add french book "Tracer des graphes avec Metapost", J. Hobby
Merge pull request #241 from ericguirbal/fr

Add french books about PGF/TikZ, Metapost and Asymptote