add README landing page

README.md

@@ -18,6 +18,30 @@ tags:
 This repository contains the open pre-print and supporting artifacts for
 ContentOS, a reproducible English+Russian AI-text-detection ensemble.
 
+## Authors and affiliation
+
+- **Gregory Shevchenko** — author, Humanswith.ai (founder)
+- **Humanswith.ai team** — methodology, calibration, evaluation infrastructure
+
+ContentOS is a Humanswith.ai product. This preprint is published under
+the author's personal HuggingFace account; the supporting code repository
+is maintained under the organization account (see "Code repository" below).
+
+- Author profile: https://huggingface.co/gshevchenko
+- Organization: https://humanswith.ai
+- Contact for collaboration: open a Discussion on this dataset
+
+## Code repository
+
+The evaluation scripts, regression test suite, and atomic-swap deploy
+tooling will be released at:
+
+- **`github.com/humanswith-ai/contentos-benchmark`** (public, planned within ~2 weeks following the v1.12 RU recalibration chain)
+
+Until then, the methodology in `REPRODUCIBILITY.md` is sufficient for
+independent re-implementation. For early access, please open a Discussion
+on this dataset.
+
 ## Headline numbers (v1.11 production calibration)
 
 | Metric | EN | RU |