Add LICENSE (model card, license, third-party IP notice)

LICENSE

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+================================================================================
+ReactiveGWM-Models — License
+================================================================================
+
+SCOPE OF THIS LICENSE
+---------------------
+
+The Creative Commons Attribution-NonCommercial 4.0 International license
+("CC BY-NC 4.0") set out below applies ONLY to the original contributions of
+the model author, which are:
+
+  (a) the trained model weights in `SF2/*.safetensors` and
+      `SF3/*.safetensors` (`ReactiveGWM_base`, `ReactiveGWM_transfer`,
+      and `Vanilla`);
+  (b) the model architecture choices, training recipe, and accompanying
+      documentation of this release.
+
+These weights were trained on rollouts derived from copyrighted commercial
+video games — Street Fighter II: Champion Edition and Street Fighter III:
+New Generation / 3rd Strike — which are © Capcom Co., Ltd. Any visual
+content the models can reproduce that is recognisably Capcom IP (sprites,
+character designs, stages, UI, audio, etc.) is NOT relicensed by this
+file. The weights are made available solely for non-commercial academic
+research under applicable fair-use / fair-dealing doctrines. Nothing in
+this license shall be construed as granting any rights, express or
+implied, in or to Capcom's intellectual property. See `NOTICE` for the
+full third-party IP statement and takedown contact.
+
+If your use of these models requires rights to the underlying Capcom games,
+you must obtain those rights separately from Capcom Co., Ltd.
+
+================================================================================
+Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)
+================================================================================
+
+By exercising the Licensed Rights (defined below), You accept and agree to be
+bound by the terms and conditions of this Creative Commons
+Attribution-NonCommercial 4.0 International Public License ("Public License").
+The full legal text is available at:
+
+    https://creativecommons.org/licenses/by-nc/4.0/legalcode
+
+A human-readable summary is available at:
+
+    https://creativecommons.org/licenses/by-nc/4.0/
+
+The full legal text is incorporated herein by reference. The key terms in
+plain language are:
+
+  - You are free to:
+      * Share — copy and redistribute the material in any medium or format
+      * Adapt — remix, transform, and build upon the material
+
+  - Under the following terms:
+      * Attribution — You must give appropriate credit, provide a link to
+        the license, and indicate if changes were made.
+      * NonCommercial — You may not use the material for commercial
+        purposes.
+      * No additional restrictions — You may not apply legal terms or
+        technological measures that legally restrict others from doing
+        anything the license permits.
+
+  - Notices: You do not have to comply with the license for elements of
+    the material in the public domain or where your use is permitted by
+    an applicable exception or limitation. No warranties are given. The
+    license may not give you all of the permissions necessary for your
+    intended use. For example, other rights such as publicity, privacy,
+    or moral rights may limit how you use the material.
+
+================================================================================
+
+REQUIRED ATTRIBUTION
+--------------------
+
+When redistributing or publishing work derived from these models, please
+include the following notice:
+
+    "ReactiveGWM-Models" by Zeqing Wang, licensed under CC BY-NC 4.0,
+    available at https://huggingface.co/INV-WZQ/ReactiveGWM-Models.
+    Trained on derivative footage of Street Fighter II and Street Fighter
+    III, © Capcom Co., Ltd., used for non-commercial academic research.