Update with compiling instructions

README.md

@@ -2,3 +2,11 @@
 This first series of slides has been initially prepared for the yearly
 [POLARIS bootcamp](https://team.inria.fr/polaris/polaris-bootcamp-may-2019/).
 
+# Compiling
+These slides rely on org-mode, beamer, pygmentize, R (and STAN), ...
+I'll set up CI asap. In the mean time you can try to compile them like
+this:
+```
+make bayesian_statistics_introduction.tex
+make bayesian_statistics_introduction.pdf
+```
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