This PR adds a clear attribution note to the README.md file indicating that ShopifyToolkit is developed and maintained by Nebulab.

Changes Made

• Added a professional attribution line "Developed and maintained by Nebulab." in the README.md file, positioned right after the project description for visibility
• Updated .gitignore to exclude the vendor/bundle/ directory to prevent committing bundled dependencies

Context

The attribution is consistent with existing references to Nebulab found throughout the project:

• The LICENSE.txt file already shows "Copyright (c) 2025 Nebulab"
• The gemspec lists "Nebulab Team" as one of the authors
• The GitHub repository URL references the nebulab organization

This change provides clear visibility of Nebulab's role as the maintainer while maintaining the professional tone of the documentation.

Testing

All existing tests continue to pass, confirming that this documentation change doesn't affect the codebase functionality.

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