docs: add CHANGELOG.md

Author: Coding-Dev-Tools

CHANGELOG.md

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+# Changelog
+
+All notable changes to ConfigDrift will be documented in this file.
+
+## [0.1.0] — 2026-05-14
+
+### Added
+
+- Initial release
+- Config file comparison (YAML, JSON, TOML, .env)
+- Environment directory scanning
+- Severity levels: info, warning, breaking
+- Breaking drift detection on critical keys (database*, auth*, api_key*, secret*, password*, token*, endpoint*)
+- CI gating with silent output mode
+- Human-readable table output
+- Machine-readable JSON output
+- `.configdrift.yaml` init command
+- Python 3.10+ support