docs: add LICENSING.md pointer to canonical IP/licensing strategy (#317)

Author: hanzo-dev

LICENSING.md

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+# Licensing
+
+This repository is licensed under the **BSD-3-Clause License** (see [LICENSE](LICENSE)). It belongs to the **public** tier of the Lux three-tier IP strategy: anyone may use, fork, or redistribute it, including for commercial purposes, subject to the BSD-3-Clause License terms.
+
+For the canonical Lux IP and licensing strategy, see:
+<https://github.com/luxfi/.github/blob/main/profile/README.md>
+
+For commercial inquiries that go beyond the public tier (e.g. private moat acceleration kernels, Eco-tier patent-protected primitives outside Authorized Networks), contact `licensing@lux.network`.