Added some documentation about the bellows

Ressource/Bellows/Tuto/MyTutoV2.1/README.md

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+### Some notes
+With a bit of practice I came down from 30min to 15min of folding. 30min is not really my worst time, I think it's more like 45min to 1 hour.
+
+Alors :
+- Les lignes plus fines c'est vraiment mieux
+- les traits de pliage intérieur extérieur mouais, pas hyper utile
+- le marquage des lignes à plier avec une aiguille ça aide beaucoup pour la droiture et régularité
+
+
+### How to fold the bellow
+
+- With the help of a ruler use a needle to score all the lines one time. I mean, first all the horizontal ones then all the diagonals.
+
+- Fold the  horizontal lines to make a sandwitch
+
+- Form the bellow