Add split description in italia and english and add directory it in levels

levels/it/sandbox/three-commits

@@ -0,0 +1,26 @@
+title = Sandbox with three commits
+cards = checkout add reset-file checkout-file commit merge rebase
+
+[setup]
+
+echo "You wake up." > you
+git add .
+git commit -m "The beginning"
+
+echo "You drink coffee." >> you
+git commit -am "First things first"
+
+echo "You hear a knock on the door." >> you
+git commit -am "Who's there?"
+
+git branch not_main
+
+[description]
+
+Here's a sandbox you can play around in.
+
+You can use both the playing cards, as well as the terminal. This is a real Git terminal! Fun things to try:
+
+- Make a commit that merges three timelines together at once!
+- Create and delete some tags!
+- Make a timeline that's completely independent of the rest!