Update markdown.md

module1/exo2/markdown.md

 #### Part 1
+## Sous partie 1
+
+*Italic*
+
+__en gras__
+
+http://github.com - automatic!
+[GitHub](http://github.com)
+
+- Item 1
+- Item2
+
+1. Item 3
+2. Item 4
+
+```
+Print("Hello World!")
+```
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