Improve create command

[FabioRosado]

This PR makes two improvements to the create command:

• Allow you to simply call pyscript create and then get prompted by the cli for a name
  • Sets default name if the user ignores it
• Allow you to do pyscript create my_file.py and it will create a my_file folder with a main and the contents of this file

I know that using pyscript create my_file.py is == to pyscript create ./my_file.py --wrap but I think if folks are going to be passing a file directly to the create command, it's likely that they want a proper pyscript folder with the contents of this file.

Fixes: #135