Update README.md

Author: trygu

toulouse-hackathon/README.md

@@ -7,4 +7,5 @@ The following documents are available:
   * [Agenda](agenda.md) of the hackathon
   * [Minutes](minutes.md) of the hackathon
   * Presentations
-    * [VTL Tools](vtl-track/demo.md)
+    * [VTL Tools](vtl-track/demo.md)
+    * [Notebook presentation](https://docs.google.com/presentation/d/1vPuNyi1rjM_QgfDtTHiOKxFH_I_sL0mMS4-yu_uC-L0/edit?usp=sharing)