Add LICENSE file

Author: Calcium-Ion

LICENSE

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+New API Docs — Dual License Notice
+
+This repository is dual-licensed:
+
+1) Documentation (CC0 1.0 Universal)
+
+All documentation content located under the `docs/` directory (including text, examples, and images/figures that are part of the documentation) is dedicated to the public domain under CC0 1.0 Universal (Public Domain Dedication).
+
+Official legal code:
+https://creativecommons.org/publicdomain/zero/1.0/
+
+If your jurisdiction does not allow full dedication to the public domain, CC0 provides a fallback license permitting use without restrictions.
+
+2) Code (MIT License)
+
+MIT License
+
+Copyright (c) 2025 new-api-docs contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
+3) Trademarks and Logos
+
+Trademarks and logos (including but not limited to all `favicon.ico`, `logo.png`, and related brand assets) are not covered by the above open-source licenses. All rights are reserved by their respective owners. Any use of these marks requires prior permission where applicable.