Add a CHANGELOG.md file, fill it in for a 1.1.0 release

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], and this project adheres to
+[Semantic Versioning].
+
+## [Unreleased]
+
+## [1.1.0] - 2026-07-09
+
+### Added
+
+- This changelog
+- Module prefix is now passed through its `meta` attribute
+  (c55943c5e8197cbc2d0e506693fd5e7e3ea0a0c3)
+- New functions `lists.cartesian.product` and `lists.cartesian.map`
+  (2af4e9f1d5dfe835c0eba15be1035bfa4065aca7)
+- Documentation strings follow RFC 145 format and are shown by `:doc`
+  in `nix repl` (#3)
+- Experimental module-level assertions (#8)
+
+### Fixed
+
+- README formatting fixes (#12)
+- Fixed usage of `or` as identifier, which is deprecated in Lix (#5)
+
+## [1.0.1] - 2025-06-07
+
+### Fixed
+
+- Removed some unnecessary restrictions on type merging (#2)
+
+## [1.0.0] - 2025-03-30
+
+Initial release
+
+[Unreleased]: https://git.auxolotl.org/auxolotl/lib/compare/v1.1.0...HEAD
+[1.1.0]: https://git.auxolotl.org/auxolotl/lib/compare/v1.0.1...v1.1.0
+[1.0.1]: https://git.auxolotl.org/auxolotl/lib/compare/v1.0.0...v1.0.1
+[1.0.0]: https://git.auxolotl.org/auxolotl/lib/releases/tag/v1.0.0
+[Keep a Changelog]: https://keepachangelog.com/en/1.1.0
+[Semantic Versioning]: https://semver.org/spec/v2.0.0.html