feat(docs): add changelog

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [1.1.0] - 2025-02-18
+### Added
+- new checkpoint with support for cystine residues
+
+### Fixed
+- fix UB bug that arises with consecutive cystine residues
+
+## [1.0.0] - 2025-02-07
+### Added
+- option to exclude solvent in output (`--[no-]write-solvent`)
+- check number of residues in input file; fail gracefully with helpful message
+
+### Changed
+- avoid usage of deprecated function (move socket file for async servers)
+- sanitise logging; `--verbose` controls all output
+
+## [0.1.0] - 2024-11-07
+### Added
+- initial public release