docs: add changelog for v1.0.0 release

Author: thorgotothegym

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [1.0.0] - 2026-05-31
+
+### Added
+
+- Initial public release.
+- Interactive Conway's Game of Life simulation.
+- Play, pause and step controls.
+- Pattern library including spaceships, oscillators and still lives.
+- Manual board editing.
+- Statistics panel.
+- Friendly onboarding copy and simulation guidance.
+- Pattern selection highlighting.
+- Collapsible pattern categories.
+- Independent sidebar scrolling.
+- Finite board boundaries.
+- Tests covering core simulation rules and known patterns.
+- Vercel deployment.
+- Custom domain support via life.aleixvidal.dev.
+- Portfolio and GitHub attribution links.
+
+### Changed
+
+- Improved simulation status messages.
+- Refined sidebar experience and navigation.
+
+### Known limitations
+
+- Optimized primarily for desktop and larger screens.
+- Board sizing for very large grids may be revisited in a future release.