feat: add CHANGELOG.md

Author: freepicheep

CHANGELOG.md

@@ -0,0 +1,31 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog], and this project adheres to
+[Semantic Versioning].
+
+## [Unreleased]
+
+### Added
+
+- Added global module management via `--global`/`-g` for `nuance install`,
+  `nuance add`, and `nuance remove`.
+- Added generated `.nu_modules/activate.nu` output from `nuance init` and
+  `nuance install` to make project module activation easier.
+- Added `nuance hook` to print a Nushell env-change hook for automatic project
+  activation.
+- Added configurable default git provider support for `owner/repo` shorthand in
+  `nuance add` via `default_git_provider`.
+
+### Changed
+
+- Updated README install docs to include Homebrew, shell script, and `mise`
+  installation methods.
+- Updated README with badges and general formatting improvements.
+
+## [0.1.0] - 2026-02-20
+
+### Added
+
+- Initial public release.