docs: describe as arena benchmark repository; Apache-2.0

README.md

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+---
+license: apache-2.0
+---
+
+# ovos-intent-bench-massive-templates-train
+
+An OVOS Plugin Arena benchmark repository. The arena's prediction runner
+publishes each plugin's raw output on the `massive-templates-train` dataset here, one JSON-lines
+file per plugin under `predictions/<lang>/`, and where a sample-set manifest
+governs scoring it lives under `sample_sets/`. The public leaderboard at
+https://openvoiceos.github.io/ovos-plugin-arena/ is computed from these rows,
+and anyone can recompute an entry from them without access to the arena's own
+infrastructure.
+
+It contains no benchmark audio or text corpus; those live in their own
+datasets under their own licences. Rows appear here as sweeps run, so an
+empty repository means no plugin has been scored on this dataset yet.
+
+Row and manifest formats: `docs/SPECIFICATION.md` in
+https://github.com/OpenVoiceOS/ovos-plugin-arena.