License TurnFlow dataset under CC BY 4.0

LICENSE

@@ -0,0 +1,418 @@
+TurnFlow dataset materials
+Copyright (c) 2026 X-EASys and TurnFlow contributors
+
+The source scenarios, source-specific judge definitions/templates, and simulator
+binding data are licensed under Creative Commons Attribution 4.0 International
+(CC BY 4.0): https://creativecommons.org/licenses/by/4.0/
+
+In the code distribution this covers all JSON dataset materials under:
+- src/benchmark/resources/dataset/
+- src/benchmark/user/resources/
+- src/benchmark/evaluator/frozen_judge/resources/
+- src/benchmark/evaluator/verifiable_resources/
+
+It also covers the corresponding dataset materials in Buka7yo/TurnFlow.
+The Python software and its documentation are licensed separately under MIT.
+
+Suggested attribution: TurnFlow, X-EASys and TurnFlow contributors.
+Dataset source: https://huggingface.co/datasets/Buka7yo/TurnFlow
+Software: https://github.com/X-EASys/TurnFlow
+When sharing modified materials, indicate the changes and retain attribution
+and the CC BY 4.0 license notice/link as required by the license below.
+
+Attribution 4.0 International
+
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README.md

@@ -1,4 +1,5 @@
 ---
+license: cc-by-4.0
 pretty_name: TurnFlow
 language:
   - en
@@ -116,5 +117,7 @@ reports are not distributed with it. The software and task documentation are at
 
 ## License
 
-See [LICENSE](LICENSE) for the dataset terms and the matching code repository for
-its software license.
+The dataset materials are licensed under [CC BY 4.0](LICENSE). The matching
+Python software is licensed separately under MIT. Please credit TurnFlow and
+its contributors, link to the license, and indicate changes when sharing adapted
+materials.