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 Android SDK Roadmap
+
+## Current Focus
+
+- Keep default API base usage aligned with `https://api.licensechain.app/v1`.
+- Maintain verify-with-details and JWT/JWKS helper compatibility.
+- Keep Android integration guidance aligned with current Core API contracts.
+
+## Next Operational Tasks
+
+- Re-run conformance after verify/JWKS payload updates.
+- Keep docs/examples synchronized with SDK and ecosystem docs.
+- Record release-impacting changes in `CHANGELOG.md`.