docs: Update Roadmap

[FBumann]

Add roadmap to Readme

Summary by CodeRabbit

• Documentation
  • Added a Roadmap section to the README detailing planned features and upcoming enhancements. The roadmap includes new plot types (histogram, violin, density heatmap, density contour), WebGL rendering performance optimization for line and scatter plots, and new figure utilities (add_trace, fill_between, sync_axes, add_secondary_x, stack) to expand visualization and customization capabilities for users.

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[coderabbitai]

📝 Walkthrough

Walkthrough

A Roadmap section is added to README.md documenting planned features: new plot types (histogram, violin, density_heatmap, density_contour), WebGL rendering enhancement for line and scatter plots, and figure utilities (add_trace, fill_between, sync_axes, add_secondary_x, stack). The content mirrors in two locations within the documentation.

Changes

Cohort / File(s)	Summary
Documentation Updates README.md	Added Roadmap section (+20 lines) detailing planned plot types, WebGL rendering, and figure utility additions; duplicated in two documentation locations

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Poem

🐰 A roadmap's drawn with care so bright,
New plots and tools on the horizon's light,
Histograms, violins, and heatmaps too,
WebGL speed for the old and new!
The future's planned, the path is clear, ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The title 'docs: Update Roadmap' accurately describes the main change—adding a Roadmap section to the README documentation with no functional code modifications.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

• 📝 Generate docstrings

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