added tools to use to understand the tutorial
added purpose of the example
example properties changed
simple signal example
the slots are automagically created, the slot name is onSignalName
Slots can contain multiple instructions
states element needs to be given even if there is only one state....
So, we can do multiple things with our slot, but what if we want to add an animation and start at it's end it won't work
changed signal name
with this, we can't detect the end of the transition
now, we can detect the end of the transition