good first issue: Improve documentation for creating custom blueprints

[devi5040]

📚 Improve Blueprint Documentation

Description

Create a dedicated guide explaining how to build and share custom Scaffinity blueprints.

Topics to include:

• Blueprint format
• Directories
• Files
• File contents
• Best practices
• Example blueprint

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Tasks

• Add a guide under docs/
• Link it from the README
• Include examples

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Acceptance Criteria

New users should be able to create their own blueprint without reading the source code.

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⭐ Support Scaffinity

If you enjoy contributing, please consider giving the repository a ⭐ to support the project and help more developers discover it.

👉 https://github.com/devi5040/scaffinity