[BUG] Bugs from 0.2.0 package

[Dimwiddle]

Describe the bug

• template directory is not created with init command
• scenarios are not valid without priority. Should default to same as feature

To Reproduce

Steps to reproduce the behavior:

1. Run spec init

Actual behaviour

No templates/ directory being created.

Expected behavior

• templates/prd-template is created
• prd.md is created with default scenario priorities.

Environment

• OS: [e.g. Ubuntu 22.04]
• Python version: [e.g. 3.11]
• SpecLeft version: [e.g. 0.1.0]

Additional context

Add any other context about the problem here.