Welcome note

[ngryman]

The first time the user visits the app, a welcome note is created to explain the basics. Something similar to what Bear does for example.

[ngryman]

There is a basic welcome message for now but we still need to add content to it. I'm moving it to the next sprint since we will have a better idea of what to put in there.

[ngryman]

One example: https://app.bangle.io/ws/bangle-help/getting%20started.md