Unknown templates during project creation

When you bsb new:

(b4py9) robin@LAPTOP-JF6T3PSU:~$ bsb new
Project name [my_model]:
Config template [skeleton.yaml]:

but you can't see which templates are available. We could either:

1) List the available options

This doesn't scale well if there's many templates 2) Autocomplete them
- We should inform the user how to do that, show placeholder text, ...

The relevant code is in

and

dbbs-lab / bsb-core