Add PRD template and update plan command to use default template

[Dimwiddle]

Description

• Introduced a new PRD template in YAML format for project documentation.
• Updated the plan command to default to the new PRD template if no template is specified.
• Enhanced tests to verify the creation and usage of the new template.

Type of Change

• 🐞 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📚 Documentation update
• ♻️ Refactoring (no functional changes)
• ✅ Testing
• 🚀 Performance improvement

Checklist

• 🎨 My code follows the style guidelines of this project
• 👀 I have performed a self-review of my code
• 💬 I have commented my code, particularly in hard-to-understand areas
• 📖 I have made corresponding changes to the documentation
• ⚠️ My changes generate no new warnings
• 🧪 I have added tests that prove my fix is effective or that my feature works
• 🆗 New and existing unit tests pass locally with my changes
• 🔗 Any dependent changes have been merged and published

Testing

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