docs: add CHANGELOG.md for v0.1.0

Author: wagnert

CHANGELOG.md

@@ -0,0 +1,19 @@
+# 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/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.1.0] - 2025-03-04
+
+### Added
+- User config directory support (`~/.config/opencode/node_modules/`)
+- Direct linking to `~/.config/opencode` when running from user config directory
+- Skip `opencode.json` creation in user config directory (uses `config.json`)
+
+### Fixed
+- Singlerepo plugin source directory detection (use `descriptor.type` instead of `isUnified`)
+
+### Changed
+- Removed npm global prefix lookup - plugins are now discovered from user config and local only