feat: add initial release with installation instructions, service configuration, and man page

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.0.0] - 2026-03-17
+
+### Added
+- Initial public release.
+- Wayland clipboard daemon: detects image copies and rewrites with compressed output.
+- Supported output formats: `webp`, `jpeg`, `avif`, `png`, `qoi`, `farbfeld`, `tiff`,
+  `gif`, `hdr`, `openexr`, `bmp`, `tga`, `pnm`, `ico`.
+- `quality` option (0–100) for lossy formats (`jpeg`, `avif`).
+- `poll_ms` option: configurable clipboard polling interval (min 100 ms).
+- `extra_mimes` option: advertise compressed bytes under additional MIME aliases
+  (useful for Discord, Slack, and browsers that request specific MIME types).
+- Filesystem image detection via `text/uri-list` (file manager copies).
+- SHA-256 deduplication to prevent infinite recompression loops.
+- Workspace-based multi-crate architecture: `lib`, `config`, `platform`, `bin`.
+- systemd user service (`contrib/k-shrink.service`).
+- AUR PKGBUILD (`contrib/PKGBUILD`).
+- Man page (`man/k-shrink.1`).