This pull request introduces several improvements to the project documentation and adds a new API endpoint for importing products from CSV files.

[goldlabelapps]

The most significant changes are the addition of a CSV import feature, updates to the project version, and enhancements to the README.md for clarity and usability.

New API functionality:

• Added a new /import-csv endpoint in app/api/import_csv.py to allow batch importing of products from a CSV file into the database, including error handling and efficient batch processing.
• Registered the new import CSV router in app/api/routes.py to make the endpoint available in the API.

Documentation improvements:

• Expanded the README.md with clearer installation instructions, environment setup, and a more detailed technology stack description.
• Removed duplicate or outdated installation instructions from the tests/README.md to avoid confusion.
• Cleaned up example usage and endpoint descriptions in README.md for better readability.

Versioning:

• Updated the project version in app/__init__.py to 1.0.4 and clarified the description to include tsvector support.

Minor messaging update:

• Improved the root endpoint's response message for clarity in app/api/root.py.