Docs update

Author: VoxHash

CHANGELOG.md

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+# Changelog
+
+All notable changes to this SDK are documented in this file.
+
+## 2026-04-06
+
+- Added repository-level `ROADMAP.md` and `CHANGELOG.md` for workspace doc-gap conformance.

ROADMAP.md

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+# LicenseChain Unity SDK Roadmap
+
+## Current Focus
+
+- Keep API v1 defaults aligned with `https://api.licensechain.app/v1`.
+- Maintain thin-client guidance and C# parity for JWT/JWKS verification.
+- Preserve compatibility with current verification response contracts.
+
+## Next Operational Tasks
+
+- Re-run conformance and sample checks after Core API contract changes.
+- Keep Unity thin-client docs aligned with workspace parity guidance.
+- Record notable updates in `CHANGELOG.md`.