Add first version of roadmap doc

Author: thibaudcolas

ROADMAP.md

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+# Roadmap
+
+This file provides an overview of the direction this project is heading. It contains both likely and more aspirational changes. For more granular improvements, see the [project’s issues backlog](https://github.com/springload/draftjs_exporter/issues).
+
+## Planned
+
+> Specific, well-scoped changes that have concrete time-bound implementation plans.
+
+## Ready
+
+> Feasible, near-term improvement ideas that are clear in scope.
+
+### Performance regression baselines in CI
+
+Add representative content fixtures and record `make benchmark` + memray stats per PR to fail builds on slowdowns in string, lxml, and html5lib engines.
+
+### Configuration cookbook and compatibility matrix
+
+Expand docs with end-to-end samples for Django/Wagtail and pure Python usage, plus tables covering supported Python versions, optional parser versions, and Draft.js releases.
+
+### Release and maintenance automation
+
+Add a tagged-release workflow that builds with `uv`, publishes to PyPI, updates `CHANGELOG`, and generates SBOMs; surface renovate rules and dependency review dashboards.
+
+### AI-assisted configuration starter kit
+
+Provide a cookbook showing how to prompt LLMs to draft block maps/entity decorators from HTML samples, and scripts to turn that output into typed configs and fixtures.
+
+## Experimental
+
+> Possible changes that require R&D, and high-risk ideas that could bring large benefits but with likely trade-offs.
+
+### Rust-backed DOM engine
+
+Prototype a Rust extension or PyO3 module for DOM construction to outperform the current string/lxml/html5lib engines on large documents.
+
+### Streaming and async export
+
+Explore a streaming API that yields HTML incrementally (sync/async) to reduce memory for very long ContentState exports.
+
+### Python 3.12+ only refactor
+
+After dropping 3.10/3.11, adopt 3.12+ features (faster f-strings, `typing.Self`/`TypeAliasType`, better `match` exhaustiveness) to simplify Options/State internals and improve runtime speed.
+
+## Backlog
+
+> Likely useful but lower-priority or “filler” tasks.
+
+### Demo gallery refresh
+
+Publish a richer set of showcases (static site and notebooks) covering Wagtail, vanilla Django, Flask, and headless integrations with generated screenshots.
+
+### Draft.js export diffing
+
+Diff outputs between engines or configurations or content states.
+
+### Security review cadence
+
+Document a quarterly process to update upper bounds for html5lib/bs4/lxml, run CodeQL/SAST reports, and refresh SECURITY.md with any findings.