Add streamxl — Rust-powered streaming XLSX reader for Python

[Mullassery]

streamxl

https://github.com/Mullassery/StreamXL

A Python library that reads .xlsx files row-by-row using a Rust engine exposed via PyO3 + maturin.

Why it belongs here:

• Pure Rust core using zip + quick-xml crates
• PyO3 0.23 bindings, built with maturin
• 4–5× faster than openpyxl across all tested file sizes (~27,000 rows/sec on Apple Silicon)
• Streams row-by-row — peak memory stays proportional to the shared string table, not file size

Author: Georgi Mullassery
License: MIT
Install: pip install streamxl / uv add streamxl

Added to the Data Processing section in alphabetical order.

[gemini-code-assist]

Code Review

This pull request adds the streamxl library to the list of high-performance data processing and serialization libraries in the README.md. The reviewer suggested removing the author's name from the description to maintain consistency with the other entries in the list.

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[gemini-code-assist]

To maintain consistency with the other entries in this list, please remove the author's name ("By Georgi Mullassery.") from the description. None of the other listed projects include author attribution in their descriptions.

Suggested change

	- [streamxl](https://github.com/Mullassery/StreamXL) - Streaming XLSX reader for Python powered by a Rust engine (PyO3 + quick-xml). Reads large Excel files row-by-row without loading the full file into memory; 4–5× faster than openpyxl. By Georgi Mullassery.
	- [streamxl](https://github.com/Mullassery/StreamXL) - Streaming XLSX reader for Python powered by a Rust engine (PyO3 + quick-xml). Reads large Excel files row-by-row without loading the full file into memory; 4–5× faster than openpyxl.