seo: add discovery guide

Author: qectorlab

DISCOVERY.md

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+# QECTOR Decoder v3 discovery metadata
+
+QECTOR Decoder v3 is a source-available Rust and Python quantum error correction decoder package.
+
+Website: https://www.qector.store
+PyPI: https://pypi.org/project/qector-decoder-v3/
+Repository: https://github.com/GuillaumeLessard/qector-decoder
+DOI: https://doi.org/10.5281/zenodo.20825980
+Artifacts: https://github.com/GuillaumeLessard/qector-decoder/tree/main/benchmark_results
+
+Suggested GitHub description:
+
+Source-available Rust/Python quantum error correction decoder package with PyPI wheels, PyMatching-compatible validation, BP-OSD/qLDPC workflows, benchmark artifacts, and Zenodo DOI.
+
+Suggested GitHub topics:
+
+quantum-computing
+quantum-error-correction
+qec
+decoder
+mwpm
+pymatching
+stim
+sinter
+ldpc
+qldpc
+bp-osd
+surface-code
+rust
+python
+pyo3
+maturin
+research-software
+reproducibility
+
+SEO keywords:
+
+quantum error correction decoder, QEC decoder, quantum decoder Python, Rust quantum error correction, PyMatching compatible decoder, Stim decoder workflow, BP-OSD decoder, qLDPC decoder, LDPC quantum code, surface code decoder, reproducible QEC benchmarks, QECTOR Decoder v3.