Added introductive notebook of matplotlib (I may need it...)

9ef36e6c · Loic Huder · b2163dfb · 9ef36e6c · 9ef36e6c
Commit 9ef36e6c authored Jun 11, 2019 by Loic Huder
--- a/ipynb/11a_intro_matplotlib.ipynb
+++ b/ipynb/11a_intro_matplotlib.ipynb
--- a/ipynb/11_visualization.ipynb
+++ b/ipynb/11_visualization.ipynb