CONTRIBUTING.md: add training exercices to do

CONTRIBUTING.md

 # Objectifs
 
-- Planifier des sessions d'1h30
-- Apprendre à programmer en même temps que l'apprentissage du langage R
-- Bien définir le résultat biologique que l'on veut obtenir à la fin de la séance
-- Commencer à réfléchir de manière fonctionnelle et linéaire à partir de la 3e séance
+- Write the session_1/bioconductor.Rmd training (and add link in session_1.Rmd)
+- Write the session_1/github.Rmd training (and add link in session_1.Rmd)
+- Write the WDI.Rmd training which will be for a later session
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WDI.Rmd

@@ -50,4 +50,9 @@ ggplot(
     color = country
   )) +
   geom_line()
-```
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+```
+
+
+# Plot of fertility rate and life expetency by country through time
+
+# Plot of GPD and child survival by country through time
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session_1/bioconductor.Rmd

+---
+title: 'R.1: Installing packages from Bioconductor'
+author: "Laurent Modolo [laurent.modolo@ens-lyon.fr](mailto:laurent.modolo@ens-lyon.fr)"
+date: "2021"
+output:
+  rmdformats::downcute:
+    self_contain: false
+    use_bookdown: true
+    default_style: "dark"
+    lightbox: true
+    css: "../src/style.css"
+---
+
+```{r setup, include=FALSE}
+rm(list=ls())
+knitr::opts_chunk$set(echo = TRUE)
+knitr::opts_chunk$set(comment = NA)
+```
+```{r klippy, echo=FALSE, include=TRUE}
+klippy::klippy(
+  position = c('top', 'right'),
+  color = "white",
+  tooltip_message = 'Click to copy',
+  tooltip_success = 'Copied !')
+```
+
+To install packages from [Bioconducor](http://www.bioconductor.org) you need to
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session_1/github.Rmd

+---
+title: 'R.1: Installing packages from github'
+author: "Laurent Modolo [laurent.modolo@ens-lyon.fr](mailto:laurent.modolo@ens-lyon.fr)"
+date: "2021"
+output:
+  rmdformats::downcute:
+    self_contain: false
+    use_bookdown: true
+    default_style: "dark"
+    lightbox: true
+    css: "../src/style.css"
+---
+
+```{r setup, include=FALSE}
+rm(list=ls())
+knitr::opts_chunk$set(echo = TRUE)
+knitr::opts_chunk$set(comment = NA)
+```
+```{r klippy, echo=FALSE, include=TRUE}
+klippy::klippy(
+  position = c('top', 'right'),
+  color = "white",
+  tooltip_message = 'Click to copy',
+  tooltip_success = 'Copied !')
+```
+
+To install packages from [github](https://github.com/) you need to
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